Let me clarify my post where I discuss the transportation costs.
I do not have a copy of the Lunar warranty, but of those I have seen, the warranty has has required the customer to return the caravan to the agreed repair workshop at the customer's expense.
For most warranty work that will be normally be as far as it needs to go, but if the caravan needs to go back to the manufacturer, the cost of that can in theory be passed to the customer under the terms of the manufacturers warranty. I am not claiming there have been examples of this but the wording I have seen does not preclude it, as it depends what is deemed to be the repairing workshop.
The CRA is different, it requires the seller to recover the faulty goods, and redeliver at no cost and as little inconvenience to the customer.
Every manufacturers warranty statement I have seen includes a phrase like, "this warranty does not affect your statutory rights" Which means regardless of how a manufacturers warranty claim turns out, you still have some recourse through the CRA.
However, keeping in mind the CRA and Manufacturers warranties are legally separate entities, The CRA only has effect between the customer and the seller/finance house, and no other parties. consequently if you have a repair carried out through the Manufacturer's Warranty by any other workshop without the sellers expressed permission, the seller could claim you have modified the caravan, and thus removed their rightful opportunity to investigate and make repairs. This could diminish your right to have a claim under the CRA.
It has been mentioned that some manufactures warranties place a limit on the cost of warranty repairs. Let me state now the CRA does not put a limit on such costs, but it may take into account the economic value of repairing or refunding.
But returning to limitations on warranty costs by manufacturers. The manufacturers Warranty despite the fact it is not advertised as such is a separate contract that new purchasers of caravans are invited to take up. It is a service contract, and even though no money is evidently charged for it, it is to all intents and purposes an insurance policy. By signing up to it you are accepting its terms and conditions. along with any limitations it may have in its T&C's. If a claim is made and rejected on the basis of a clause which is not printed in the Terms and Conditions (other than created by a change in the relevant laws) the manufacture would be in breach of its own T&C's
Specifically, if the policy does not say there is a limit to the value of the repairs to be carried out, they cannot impose a limit. If there is a limit in the T&C's and it is insufficient to repair a caravan with an admissible failure, The customer might be able to claim the policy is not fit for purpose, and seek rederss through the CRA.