Jaysus, but me head is melted trying to whittle down this list...
121
141/181
071
B113/114
A class
Honorable mentions: B101, C class, E401/421, G class, Woolwich Mogul, MGWR E/J26 class 0-6-0, C&L 4-4-0, CB&PR 2-4-2... and too many others to list here!