There are, I bleeve, only THREE 760mm gauge lines in England - Whipsnade Zoo, Sittingbourne and Kemsley [SP?]. and the W&Ll. All of their locos have run there - 'Superior' this year at the gala weekend.
On the other tentacle, the vast majority of Welsh NG are around the 2ft gauge, with correspondingly dimensioned rolling stock. One of those 'little Welsh railways' also has the largest 2ft gauge locos running in UK - the Welsh Highland railway runs a number of the magnificent ex-SAR/ACR NG/G16 Beyer-Garratt articulated locos, and yet another, an NG/G15, formerly running in the grounds of a tree nursery in Switzerland, is due to be running on the Vale of Rheidol railway soon.