Just another thought on the shifting issue you had (too late now, but whatever), the SRAM chains have a very different side profile when viewed from the top. The link plate sticks out in the middle, enabling it to mesh with pickup ridges better. Shimano chains and sprockets have a slightly different design. This may make the difference.
Thanks Jur,
Bike is riding very nicely and happily. With the higher pressure tyres I have gone back to using the red rear polymer suspension. Point about rear brake noted.
Now, today I met someone with a whole host of ultegra cassette parts who suggested we build a frankencassette with the 9,10,11 of the capreo 10 speed and then using 7 pieces of a 12-28 from a normal functioning ultegra cassette. Tempting...