@G Funk There's this NAD T777 - on clearance with full warranty. Only trouble is it's collection only from their Maidstone store:Why on earth would you pay £800 for secondhand electronics with no guarantee and no support when you can get a new one for £999 or ex demos, open box etc with full warranty for £919-£949? Just crazy.
The NAD T 777 V3 AV Receiver is packed with the latest audio and video technologies, including Dolby Atmos® surround decoding and 4K UltraHD (60p/4:4:4) video pass-through, letting you enjoy every moment and detail of your favourite movies, music, and entertainment.
Sevenoaks also have some Arcam AV20's on clearance - albeit a little over your initial £1500 budget.
Both of these AVR's are considered by many to have better Room Correction (Dirac vs Audessey)... Although I've personally not heard either a NAD or Arcam, so can't comment any further.