I have worked for the same professional services firm for the last four and a half years, and our promotions/raises etc happen in October. My raises have been 21%, 1%, 13% and 5% - plus the technical staff had an extra 5% last year as we were fighting RBS for new hires and had to do something to attract new grads etc. We still have headcount requirements in the UK for technical/infosec folks, in case anyone is interested - PM me and I can discuss the roles

If all goes well I am hoping for a promotion in October with a payrise of about £20k, if not, then I might get an extra couple of grand.