For those who wish to avoid the 387s, this is what I make to be the list of services off KX that will be 387s. This doesn't include Royston peak fasts, any non-stop Cambridges, fast Peterboroughs, or stuff terminating at Welwyn. Everything else will be 365s, unless any 317s or 321s hang on covering unavailable 365s/387s. A source tells me 2x321s are currently remaining on lease or hire covering for unavailable 365s, until further notice.
1x387
0604, 0652, 0704, 0734, 0904, 0934, 1004, 1204, 1234, 1334, 1404, 1504, 1534, 1653, 1918, 2004, 2034, 2104, 2204, 2252, 2304 (Mon to Thurs only), 2334 (Fridays only).
2x387 or 3x387
0834, 0952, 1552, 1650, 1713, 1722, 1743, 1752, 1822, 1823, 1852, 2022, 2122, 2322.