Again, many thanks for the helpful advice and suggestions.
I've spent a good few hours on the phone and even more surfing (oggling) various options. XPlanet were particularly helpful and have offered a build up of either their DirtyDisco or Viner with SRAM Rival 22 groupset with hydraulic disc brakes. If I can't do my own build they will be high up on my list for a fully built bike I think.
On the other hand, my local store have also been very helpful and offered to get me a similar groupset that will fit my Genesis. They have also offered a good sounding deal on carbon forks, and a few other parts. If I pick quiet times they say they can even assist (for a small fee) and I can build it with their help. Access to all the right tools etc... Alternatively, a work colleague's hubby is more than happy to help me with the build if I get the groupset - charges just a few beers and has built more of his own bikes than I have had hot dinners. Both are good offers; I can get the quality groupset I want, add a few carbon bits to my steel frame and see how they go. If it all works I can get a good quality carbon frame a few months down the line (spread the cost a bit) and, with the experience of the initial build, I should have a half decent idea of how to swap them all over.
I know it is all a bit of a reversal of my initial plan, but any further thoughts?
J