No tv on 12v ?

no worries, i hope its as simple as that

Nope it wasnt "as simple as that" ...... I tried the adapter and it wasnt that :(. Never mind  . Ill have to get it sorted when i have it serviced in october :  i darent mess with the fuses as theres just a "nest "of em under't bed lol : (my autotrails always had each fuse clearly marked. ) i can live without telly when on 12 v ,thanks for help regards mrs bc:)

have you tried the phone charger in the adaptor? perhaps there isnt sufficient voltage via the adaptor for your tv?

we need to understand if the socket is live, so the voltmeter might be useful.

Sure it's not as simple as a blown fuse in elecroblok They are standard auto fuses available from all good auto accessory shops and Halfords. 

I had a problem where the 12V power lead stopped working and was blowing fuses even without the TV connected.

When I disassembled the fuse holder, multiple flecks of metallic plating fell out of the housing which I assume had come away from the internal electrodes.

One or more of these were obviously shorting the live & earth electrodes. When I put it back together the fuses stopped blowing and the voltage was fine.

I wonder if black caviar still has an electrical problem almost 8 years later ..... 🙄