Strange condensation in fridge

[Baycott]

My fridge has started to have condensation on the freezer door.
It keeps temperature well (although won't work on 12v) but the water runs off the freezer door into the top tray on the fridge door.

Not a great picture but I hope you get the gist.
Any ideas ?

 

[rb62]

Door seal not sealing properly? check it with a sheet of paper

 

[Two on Tour]

Door seal not sealing properly would be my suggestion too, drawing in warm moisture laden air which condenses on contact with a cool surface

 

[Baycott]

Thank you rb62 and Two on Tour I‘ll check that today.

 

[gus-lopez]

Yes & me for the door seal

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[phillipsheila]

seal also