Thanks Ken, but I have found a company at Fareham that stock then.
Vitesse Marine Ltd, Unit 4, Fort Wallington Ind. Est. Military Road, Fareham, PO16 8TT, Tel: 01329 232360
They keep the new models of the "Supercool" fridge cooling units. They also keep spares and carry out repairs.
They advised that the new units need a slight increase in the size of the mounting hole.
I took my unit in and they found it was just a fuse on the circuit control board, which they replaced free of charge and gave me a spare fused. All fixed in 15minutes. How cool is that !!!! (sorry for the pun.)
Even better news is that they say these units are very reliable and can last as long as 25 years.
If any one needs help with one of these units, Vitesse Marine is the place to go.