Swob Crosby 57cm Geometry is in the link below:
Review here in case you have not heard of it
Basically it has a great frame and fork. You can fit racks disc brakes etc. All the guides are there for gears, and last time I looked there was a company that could make the dropout for running gears. I used it for riding the lanes and single track and it was a lot of fun.
It needs a bit of TLC, I have been riding it but the bottom bracket has play in it, so does the front hub. The rims are pretty worn.
£200, pedals not included