The rest of the car will rust away long before a Honda engine cashes in its chips - don't even worry about 200K as long as decent oil has been changed regularly - it is just nicely run in. Check the internet for high mileage Honda cars, there are sites in USA where Honda cars have 1Million+ miles on them without having any work done on the car - no reason why cars in the UK would be any different. With modern materials, oils and closer tolerances when engines are made forget about the bad old days when engines needed a rebore and rebuild at less than 80K.
