Well, for a start it is not British - I think it's german. Take a look at this thread:Does anyone know of this locomotive: LGB/Aster 2901 Frank S. 0-6-0 Live Steam Engine G-Gauge?
The Frank S, the real one, is alive and steaming again
Here's a more interesting description:
Locomotive of the Month
Most LGB locos will go around R1 (2' radius) curves, though I am not sure about this one. (Mike Toney's write-up says it will handle R1.)