I applied to 6 universities but the ones I went to see and know most about for B/M are KCL, Nottingham and Warwick. They are all very good universities in general and for B/M courses.
KCL, central London- BM one of the best courses at King's and this is reflected by its relatively high entry requirements. Typical offer - AAB or ABB (if you do Maths A level). The course gives a broad coverage of all aspects of BM but you choose many of your modules. The first 2 years have 2 compulsory units in Quantitative & Qualitative Methods (Math/Statistics). In the final year you choose all 8 of the modules. Intake of around 100 with around 20 applicants per place - sounds like a lot but its not as competitive as it appears since most people applying don't meet the requirements. Single honours or joint with Maths, Computer Science, French, Physics and probably more. Top 20 university and good reputation as part of the prestigious University of London. Course rep has been improving massively recently, from 31st to 15th to 9th according to the Times rankings.
Nottingham - has the advantage of a large business school so research is excellent, there are even more modules to choose from, facilities and resources are excellent. It is located on the Jubilee Campus, which opened in 1999 so its v new and it looks great! Many combinations of degree including Industrial Economics (and Insurance) for a more academic path, Management with a language e.g Spanish or even Chinese. Possibility of going to Nottingham's campus in Malaysia (which is a good experience and much cheaper too!). Typical offer - ABB, intake around 175 for straight Management. also has specialised degrees in E-commerce & Digital Business and Finance, Accounting and Management. Modular/Credit system so you can choose literally any modules from Politics to a language as one of your options for credits. Top 10 - 15 university with great reputation and top 5-10 for the course
Warwick, 3 miles from Coventry, near Leamington Spa and Birmingham - has a very large business school with all the advantages of Nottingham and added reputation. Courses include Management, International Business (must have a language and it is 4 years) and Accounting and Finance (some exemptions from major accountancy bodies). Management in particular is very flexible since 9/15 of the modules in the 3 years are chosen by you and the other 6 are compulsory. With so many options you can specialise in Marketing, Operations or Personnel Management, Accounting & Finance, small business management etc. University reputation is great, top 5-10 and the course is also very much top 5, being well taught and having so much flexibility.
Sorry I don't know as much about other universities but other good choices for B/M include Aston, Bath, Birmingham, Durham, Edinburgh, Glasgow, Imperial (for joint degrees with a science subject), Lancaster, Loughborough, LSE, Oxford (for Economics & Management), Manchester and others I cannot think of!