maharaaj dee kirpa naal, many unis in the uk now have very strong sikh societies,
so its tough trying to narrow down which have the most sangat and events etc
what i did was decide on my course first, then look at which universities were best for my course
i then chose a few which id thought id like and could get into, n ranked them according to which had the most sangat in tht general area. so ultimately my first choice and insurance were based on the amount of sangat/programs at the uni.
that might be easier than deciding on an area, then trying to find a decent uni there, and then seeing if it does your course.
keep us posted!
edit- if you havent heard of it already, the times good university guide is really useful as a rough guideline.