I applied to
Imperial RMFE, Oxford MCF, UCL Computational Finance, and LSE Financial Mathematics.
Out of these universities, the LSE program and Oxford program are probably the most well known, then probably MathFin and RMFE at
Imperial, and last UCL.
I think LSE and Oxford are the only ones on par (recognition-wise) with the top American programs.
Unfortunately, I don't know if there are any other programs in the UK that are as well known, although I've heard MSMF at Warwick has an excellent reputation in addition to the programs stated above, but probably not on the level of top American programs.