I meant to add, just as a general comment, that the old Bradford Barton 'GW Steam...' albums are a great scourse for WR formations, with many of the photos taken in the late 40s through to the early 60s there are plenty of Collett / Hawksworth / BR combinations, with a few ex- LMS / LNER vehicles thrown in. I know the precise vehicle types aren't that easily identifyable in a lot of them, but the general formations I find very helpful. Most of the albums I've got were picked up very cheaply over time, usually between £2 and £5 each!
Nidge