A final update for those still awake and who care. Took the Galaxy to Mr Ford in Farnborough (Hants) with engine trim etc removed ready to pop the new filter into place. Sounded even more tractor-like with less sound-proofing...! Anyway, a kindly engineer came to look, tried for 5 minutes before grabbing a ratchet spanner from his workshop. He took the passenger side wiper off and removed the bolt, followed by a second bolt in the middle of the wiper linkage assembly at the front. The whole wiper assembly was then free to be pulled down on the passenger's side, just about 4-6 inches. A moment later and he had success, put it all back together and left me to it. I gave him a tenner for his trouble. He said that sometimes they go in but sometimes they don't. His trick always sorts it for him. Having seen him do it I reckon I could do it myself next time - except with the Galaxy having just completed 150,000 miles I don't think there will be a next time...!