Insurer Intervention: What the Case Law Says

Disclaimer: This note is general guidance, not legal advice.

Intervention is one of the most common tactics insurers use to challenge credit hire claims. The argument is straightforward: the insurer says they offered the claimant a replacement vehicle directly, the claimant declined, and therefore the credit hire charges should be reduced or disallowed entirely. CreditHire Assist builds the case law arguments credit hire teams use to answer intervention challenges.

It sounds reasonable on the surface. But the case law places a far heavier burden on the insurer than most realise. Getting the response right, grounded in the right authorities, is the difference between a settled claim and a protracted dispute.

1. The Burden of Proof Is on the Insurer

The starting point is Copley v Lawn [2009] EWCA Civ 580. The Court of Appeal was clear: the burden of proving that a claimant failed to mitigate their loss rests on the defendant. In the context of intervention, this means the insurer must prove three things. That the offer was genuine. That it was available. And that it was comparable to what the claimant actually obtained.

A letter saying "we offered a vehicle" is not enough. The insurer must produce evidence of the specific offer, including the vehicle, the terms, the delivery date, and the conditions attached. Without this, the intervention argument fails at the first hurdle.

In practice, many intervention letters contain vague references to a "suitable vehicle" without any supporting detail. Under Copley v Lawn, this is a statement of intent, not a genuine alternative.

2. The Offer Must Contain Sufficient Detail

Manton Hire v Ash Manor Cheese [2013] EWCA Civ 1384 raised the bar further. The Court of Appeal held that an intervention offer must contain sufficient information to allow the claimant to make an informed comparison. This includes the precise terms, conditions, and vehicle specifications.

What does "sufficient information" look like in practice? At a minimum:

The specific vehicle model being offered (not just "Group B" or "similar class").
The location of the vehicle and the delivery arrangements.
The exact date it would be available.
The duration of the offer and any conditions attached.
The insurance arrangements, including any excess payable by the claimant.

If any of these elements are missing, the claimant cannot make a meaningful comparison between the insurer's offer and the credit hire provision. And if the claimant cannot make that comparison, they cannot reasonably be criticised for declining the offer.

3. The Offer Must Be "Clear and Genuine"

Sayce v TNT (UK) Ltd [2011] EWCA Civ 1583 confirmed that the defendant must prove their offer was clear and genuine. This goes beyond simply writing a letter. The court will look at whether the offer was realistic, whether the vehicle was actually available at the time stated, and whether the terms were genuinely comparable.

This is where the "basket of services" argument becomes critical. Credit hire agreements typically provide a package of benefits that a standard spot hire does not. These include CDW (collision damage waiver), delivery and collection, a like-for-like replacement, and nil excess cover. If the insurer's offer does not match this package, it is not a genuine alternative.

The nil-excess point is particularly important. Bee v Jenson [2007] EWCA Civ 923 confirmed that a claimant is entitled to reject an offer that would expose them to a contractual liability they would not otherwise have faced. If the intervention vehicle carries an excess (and most do), the claimant is acting reasonably by declining it in favour of the nil-excess protection provided under the credit hire agreement.

4. The "True Cost" Requirement

Copley v Lawn also established that the claimant must be informed of the "true cost" of the hire to the defendant. This means the insurer should disclose the daily rate they would have paid their supplier for the intervention vehicle.

Why does this matter? Because the court needs to assess whether the claimant's decision to continue with credit hire was reasonable in light of the available alternatives. If the insurer will not disclose what they would have paid, the court cannot make that comparison, and the insurer's argument is undermined.

In correspondence, this creates a practical opportunity. Requesting the actual letter sent to the claimant, the full terms and conditions, and the daily rate the insurer would have paid their supplier puts the insurer on the back foot. If they cannot or will not produce this information, it speaks volumes about the quality of the original offer.

5. What a Strong Intervention Response Looks Like

Bringing these authorities together, a well-constructed response to an intervention argument should do five things:

Challenge the burden. State clearly that under Copley v Lawn, the burden of proving mitigation failure rests on the insurer, and that they have not discharged it.
Demand specifics. Under Manton Hire, require the insurer to provide the precise vehicle, location, delivery date, and terms. If these are absent, say so.
Test the offer against the basket of services. Under Sayce v TNT, compare the intervention offer against the credit hire package. Identify any gaps, particularly around excess and insurance cover.
Raise the nil-excess point. Under Bee v Jenson, if the intervention vehicle carried an excess, the claimant's rejection was reasonable.
Request the true cost. Under Copley v Lawn, ask for the daily rate the insurer would have paid. If they will not disclose it, note this in the response.

This approach puts the insurer in a position where they must justify their argument with evidence, not assertions. In our experience, the majority of intervention challenges cannot survive this level of scrutiny.

6. Why This Matters for Handlers

Intervention arguments succeed most often when the response is weak. A generic reply that says "our client was entitled to hire" without engaging with the specific authorities gives the insurer room to push back. A response that walks through Copley, Manton Hire, Sayce, and Bee v Jenson, applying each to the specific facts of the case, is far harder to challenge.

The practical difficulty is that not every handler has these authorities at their fingertips. CreditHire Assist addresses this by building the relevant case law into the response workflow. When an intervention challenge comes in, the system identifies the applicable authorities and structures the response around them. The handler reviews, adjusts for the specific facts, and sends. What used to take 30 to 45 minutes of research and drafting takes under a minute.

The case law on intervention is well established. The challenge for credit hire teams is applying it consistently, on every case, under time pressure. That is where the gap usually opens, and where the most recoverable value is lost.

Key Authorities Referenced

Copley v Lawn [2009] EWCA Civ 580. Burden of proof on insurer to show failure to mitigate. Claimant must be told "true cost" of the hire.
Manton Hire v Ash Manor Cheese [2013] EWCA Civ 1384. Offer must contain sufficient information for claimant to make an informed comparison.
Sayce v TNT (UK) Ltd [2011] EWCA Civ 1583. Offer must be "clear and genuine." Must match the basket of services provided.
Bee v Jenson [2007] EWCA Civ 923. Claimant entitled to reject an offer carrying excess they would not otherwise face.