The UK channels broadcast on the lower part uhf chls 21, 24, etc. were switched off on tuesday alright but the deflector broadcasting them on uhf chls 48, 52, 54 & 58 is still going. I always thought they were both part of MCTV or are these ones from someone else?
See this document. See section "Deflector licenses offered". UHF channel numbers are in the second last column.