Thanks both for your responses. I have looked at the discussions in the forums for the 800D v4 PSU, but I cannot see where to buy or what the part code / manufacturer's are.

Can anyone give me a lead so I can purchase a replacement in the UK?

Thanks

DSP8000.1's, 800v4, G68ADV, 218, MC200(1TB), TWINSTORE, QNAP TS-251, Meridian 505, Kef Ci200QL In Wall Centre, DSP3200's rear, Samsung UE65HU7500, Sony BDP-S790, Sky Q Silver, Michel Gyro SE with TecnoArm, Spectral Brick cabinet.
Spare; 596, 568.2mm.