So, update re my new bumpers. Having enlisted the very kind help of Pete and Clive a couple of months back on a sunny but freezing Saturday afternoon, on which we tried and tried to fit the bumpers but had no joy. I had another attempt to fit them after that but still failed miserably, so I contacted the people that resprayed my car a couple of years back for some advice, as they'd removed and refitted the bumpers at the time. I ended up booking the car in with them and for one hour's labour charge, the car is now wearing his brand new gleaming white bumpers. I guess now I owe it to him to finish the job off with a set of shiny new chrome end caps!