"Mr Thant" wrote

There is no case for spare long platforms in case of weekend engineering
works on Thameslink etc either...

If the majority of the Thameslink fleet is indivisible 12 car trains,
then yes there is.

9 long and 3 short platforms should be enough for 5 tph NXEC, 6 tph
Cambridge/Peterborough, 4 (or even 8) tph inner suburban, if they can't go
back to Moorgate, and one HT/GC/GN.

Peter