I want to work in Consulting firms in the UK after MBA. I have offer from Sussex with 7K pounds scholarship, and will have Strathclyde MBA interview on 1st December. Tuition fees of Strathclyde is 32K pounds.

Please share opinion which one is better opinion for working in the UK in top consulting firms: BCG, McKinsey, Bain, etc.

Both B-schools are unlikely to place you in top consulting companies that you have mentioned. I suggest considering applying to top B schools such as LBS, Insead and their likes to have a realistic chance of getting a shot at these companies. Having said that your previous qualifications and experience will play equally important role if not more in getting placed in these companies.

Neither of these schools will normally be able to place MBAs into those sorts of strategy consultancies. You'd need to look at a school at least as good as Alliance Manchester, or better.