I’ve now had time to have a proper look at what May brings (or doesn’t bring!) for the south end of the GN route. As far as weekdays go:
* Thameslink services on the Horsham/Peterborough and Cambridge/Brighton routes are essentially as per what May 20 originally proposed. All 12-car. The only change is that the various morning peak workings which used to start at Gatwick Airport haven’t returned, virtually all of the Peterborough service now originates from Horsham. There’s also been some tidying up of reporting numbers compared to May 20, mainly in the early morning and late evening.
* On the above Thameslink services, the number of up services which use Finsbury Park platform 4 has increased. There’s also a slight increase in down services using Stevenage platform 3, and one down evening peak service runs via Finsbury Park platform 5.
* Cambridge/King’s Cross 2Cxx Thameslink service is essentially as May 20. Diagrams generally no longer interwork with the Welwyn services at King’s Cross during the peaks, though there’s one crossover which has been built in during the early evening. One midday out and back working continues to reverse at Letchworth instead of Cambridge which is presumably to accommodate freight. All 700/0 as far as I can tell. Two up services run via Welwyn Garden City platform 1, and four down services run via platform 4. Just one down service runs on the fast lines between Finsbury Park and New Barnet.
* Three peak-flow Peterborough fast workings, all 2x387. One of these stables at Letchworth with ECS moves in consequence.
* Cambridge/King’s Cross fast services are largely as per May 20 inwards of Cambridge except that it is now solid 8-car. I can’t see any weekday 12-car at all. Beyond Cambridge continues to be slightly reduced in the peaks, this may be a permanent change as a result of Kings Lynn 8-car having happened.
* 717 services are half hourly to both Stevenage and Welwyn Garden City, increasing to 4tph on both routes during the peaks. There are two peak-flow Gordon Hill extras per peak. One change is that more services use Alexandra Palace platform 2, with all services booked to use that platform during the midday period. There’s a slight increase in services using Finsbury Park platform 2 as well, though fairly inconsistent. One evening peak service calls at Alexandra Palace platform 2 and then crosses to the US2 line, which is a fairly rare move for passengers.
* Welwyn Garden City/Sevenoaks happens, there’s two evening peak services which do Finsbury Park/Sevenoaks. The 700/0 requirement increases by one to facilitate these extras. Working at Welwyn Garden City has changed slightly, with some Sevenoaks services shunting via the reversing siding and departing from platform 1 instead of departing from the down side island. A couple of Welwyn trips are missing compared to 2019.
* Peak Baldock services remain completely missing, and no other Peterboroughs bar the peak trio.
* LNER looks to be largely a roll-over of present. Nothing of interest noted. More services are pathed as IEP, but in many cases have had allowances added to return to the previous paths.