Just regarding upgrades to Slatyford routes, the 10, 11, 30, 31, X47, X87 and X88 could all really do with E400s. I wouldn't recommend just replacing the MANs with long length E200s. The X77/78/79 has somewhat complicated interworking diagrams with the X82/87/88 so you couldn't really upgrade the Newbiggin Hall expresses without also upgrading the others. The 6 and 7 could also do with an upgrade in capacity. The 55 and 06 reg MANs would be ideal for this.