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The cost of the licence is no more than £145.50 and you need to buy the licence from the UK. It is not something that is sold abroad. Happy to discuss but please rate positive.
I am unclear to what is not answered. There is no additional fee (save for the cost of a TV) and you can not buy the licence until you are in the UK.
I am unclear as to why you would want one prior to coming to the UK. They are pretty standard and you can get on arrival.
I think I will opt out instead.