My daughter is Sarah Smith! She lives in Cumbria.
Sounds like multiple things, and because of the cost of parts, it is best to call a service engineer. The standard fix would be to replace the thermostat or thermistor sensor. The fact the display has failed is likely to require a new control board and display as well, but one may be causing the other.
Common solutions for: U
-Line Refrigerator freezing
food. The temperature control thermostat directs voltage to the compressor, evaporator fan motor, and condenser fan motor (if applicable). ... If the thermistor is defective, the compressor and evaporator fan may run too frequently.
and it actually seems like a common issue
https://www.google.com/search?q=U+line+wine+fridge+freezing
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