Martin
Thinking back to the Serven, we obviously did a number of locks (Stourport to Tewksbury) but as we were to enter Diglis lock a patrol boat with three spotters (yes three) came out, this was confirmed by the lockie as spotters. So it was probably them who spotted me.
As others have said why on Earth don’t the river sighting get added to the record, dead easy and cost cart nothing to do.
this probably is the reason why a few years ago I got a letter about overstaying a mooring, even though we’d been down the Severn in the period and were recorded at every lock.