Sorry guys only just come back to the forum, for some reason I didn’t get notification of your replies.
I have 240volt mains supply to the boat, UK 3 pin sockets have been fitted around the boat. The 2 pin sockets are not connected to the mains and they have some pretty crude wiring which made me assume they were 12 volt, I will have to check that.
I thought they may have been standard Bavaria sockets but in the absence of lots of people telling me about them I am presuming not.
There are a few of them the most prominent 2 are 1 by the galley sink and 1 inside the locker above the sink in the heads.