All the Best, Andrew.
From 2014 Govia Thameslink Railway had a long hybrid franchise to cover introduction of Cl 700, but like most others it was converted to a Covid Emergency Measures Agreement which expired on 31st March 2022. From 1st April, it's had an interim National Rail Contract for 3 years with an optional 3-year extension to 2028, but should be converted to a Shapps-Williams Passenger Services Contract when Great British Railways starts.
As passengers have not returned so quickly as expected, DfT is trying to save costs everywhere. I don't know whether operators volunteered or were bullied into cutting services, but GTR's Cl 455s will go off-lease tomorrow without replacement as the new timetable from 15th May will see some services halved from 4 trains per hour to 2, or 2 to 1, or even to 1 train every 2 hours, while some remaining services will be cut from 12-cars to 8, or 10 to 5, or 8 to 4.
To add a small Cornish connection to the attached photo, this morning I moseyed up to Streatham Common which at our 2020 AGM was the subject of a talk by a former CRS Chairman to illustrate where he learnt the art of train-spotting!
Best wishes, John.