Yes, advise your insurance company that you wish for them to place in writing that they will cover any future damage to the running gear of the vehicle should it fail, as you suspect damage to the engine/gearbox suspension/wheels and tyres. Is the garage owned by your insurer or is it your Porsche garage? Either should have incorporated the items mentioned within the blueprint of repair they provided to Esure. Your car is a total loss all day long. They should settle the claim as a total loss, and pay interest from the date of loss. Raise a complaint about the insurance premiums and tax, as their ineptness has caused this situation.