Just an update - I would appreciate if anyone has any ideas?
I left the fridge off for 48 hours so it was completely defrosted, then turned it back on with nothing in the fridge or the freezer compartment (no trays, drawers, or food). After a few hours the fridge dropped to between 0 and 4 degrees, and stayed like that for a further 24 hours or so. I started to put some trays and a few bits and bobs in and the temp rose slightly (I guess this is normal) before cooling again. I carried on putting a couple more trays in, however this time the fridge rose to 15 degrees and is stayed constantly at that temperature – I believe putting the trays in is just a coincidence and didn’t cause the fridge to stop cooling!?
Looking in the freezer compartment I can have noticed something – when the fridge door is opened, the paddle that blocks and lets in air up to the fridge is spins for quite a while – is this normal? Eventually it will either close or open – mostly open I think. I believe that this sometimes also causes a clicking noise at the very top-right of the fridge (some sort of relay ?), Should this continue to click after the fridge door is closed – I am pretty sure that it does click quite a lot!
I turned it off and on again and now the paddle (what is the proper name for it!?) is open and the fridge has currently cooled a bit to 10 degrees.
Does anyone have any ideas of what it might be – or at least where to start looking/testing?