UK schools are not ranked here in UK. They are all considered to offder a similar standard of education as regulated by the GMC.
Some broad sheet newspapers make an attempt at ranking them but thet differ significantly with their results as they use different criteria and the schools are so similar in the quality and content of the education they provide, their is very little to differentiate between them.
What is important is HOW they deliver that education as the teaching methods do vary from PBL (mostly groupwork) to traditional disciplines such as antatomy etc taught seperately (mostly lectures and labs)to systems approaches (a combination of the two).
HTH