From what I've learnt through speaking in person to ATCOs, successful candidates of the recruitment process will normally be asked of their preference between Area and Aerodrome. However, ultimately NATS must allocate Trainees onto courses in accordance with their business needs.
Another interesting point I picked up is that aside from the business needs, NATS may look into the profile of the individual candidate to determine which discipline would suit them better.
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This is a side note, and probably slightly off topic, but given the PPRuNe is a professional forum, would it not be courteous to adhere to usage of correct spelling, punctuation and grammar whilst using the various pages available? Please correct me if I'm kicking up a fuss over nothing, but the 'text speak' becoming prevalent in many recent posts has been irritating me to a certain extent.