Just something I've been trying to work out but everything is allover the place lately. Am I right in saying that the official allocations, on paper, for these two depots are with some of them spares in the blocks:

X7/X8/X9: 1493, 1501 - 1505, 7601 - 7608
X10/X11: 7611 - 7617, 7621
306/308: 1480, 1495, 1496, 1500, 7628 - 7637
43/44/45: 7501 - 7507, 7509, 7522, 7553 - 7556
47: 1499
51/52/53/54/55: 1574 - 1588
Spares / Schools: 1512, 1513, 1542, 1543, 7524 - 7526, 7557, 7558, 7560, 7562, 7620, 7622 - 7625

Obviously in the real world it's just throw anything on anything.