Colocation facilities in britian

Does anyone have ballpark costs on what colo space costs in
England. We are getting a quote for 7500 gbp per month For 19
square meters of space. In us we pay 3500 a month for 10x10
cage at a quest facility Also I'd anyone can recommend some
british colo companies would appreciate it has good information about many London data
centres. Definitely check what power is available, it is quite restricted
at some locations.