Write to the dealer principal and lodge a formal complaint. Send the letter by recorded delivery and outline the problems you've had and costs incurred, by your van being off the road for seven weeks. Demand a like-for-like replacement vehicle while your van is being fixed. If they refuse, inform the dealer that you'll hold them liable for the costs incurred for renting a vehicle until the work is complete - that should prompt them into finding you a temporary van. Otherwise you'll need to take legal advice on suing them to recover the costs incurred by renting a vehicle. Waiting two months for an engine replacement is unacceptable. Law here: www.honestjohn.co.uk/faq/consumer-rights/