GCHQ certainly want linguists but they don't seem very well paid. Pakistani guy I knew applied for a job there but stopped when he saw how pathetic the wages were. He now works happily for P&G.
He also told an amusing an amusing story about being a student in the US. When his fellow students found out he was from Pakistan, some asked if he rode a camel! After he was asked this for the third time, he started saying that he kept one in the parking lot behind his apartment.