Thameslink at Greenwich is one, 1tph of the off-peak service has switched to Unadvertised Passenger Service (runs as required) in the data. That's also the same on a Saturday. Several trains at Brighton are also runs as required mid week including some off peak. It doesn't look like there are many others though.I'm not sure what the person you're quoting is talking about - Southeastern and GWR services are affected by line closures, and I can see the removal of a few peak extras for Southern, but I can't find any of these ridiculous, swathing cuts to off-peak services for any other TOCs.