QUOTE
how will Jersey be able to operate if they are unable to see the aircraft on the apron due the tower being in cloud??
UNQUOTE
Just the same as they do anywhere else such as Heathrow.
I understand that EGLL has 'Tower in Cloud' procedures for just this scenario. Why don't you ask the 'NATS people' who you say are 'running Jersey' now to see if they can have a look at the Heathrow procedures and create some for Jersey?
Basically it's LVPs with the aircraft being able to see better than the Tower!