We followed your advice and went to the Automatic Gearbox Centre in Luton. Despite giving them a very tight timescale, and them having to urgently obtain a part from Sweden, they completed the work satisfactorily the day before we went on holiday. They explained what they were doing very well and were keen to show my wife the damaged parts. The cost was about half that of a replacement and we have an 18 month warranty from them. All went smoothly and we had one of the easiest runs we've ever had to the Alps and back. Thanks for your advice, much appreciated.