Some nice comparisons here, the first 2 being round top & Belpaire firebox 27s, second of which involving a not so common double-header for the L&Y.
The next shows 2 more Aspinalls, but with 12604 in superheated condition.
Lastly an Aspinall facing down a Cauliflower, the LNWR's final 0-6-0 design.