Masters from UK - University selection

sir i'm in engg. final year,iwanna do masters from U.K.,but i m not able to decide that in which field i should do,should i continue in engg. or i should go in commercial field like in marketing,finance or international business, though i have applied in universities namely surrey,birmingham,leeds,edinburg,nottingham,cambridge,so plz guide me that which university should be opt,who holds good gravity in the market,though i'm intrested in marketing