Thanks Nigel for replying.
Not sure how old the set is, but it is labelled Grundig - Lenaro. I live in northern Ireland.
The other boards are labelled BEKO, but the only marking on the psu board is gdp-002, 94v, cem1 - strange, I don't think the psu board was manufactured by BEKO.
I have a copy of the service manual which contains the schematics etc. but the schematic for the psu board is incorrect as it is labelled BEKO Z1J194-11 and as I say I have removed the board and it does not correspond with the schematic.
Still looking for a schematic for the psu.
Regards, Derek