Their British Pub culture guide (http://www.sirc.org/publik/ptpintro.html) is the best and I think the only available research on the subject. It really helped me when I moved to the UK...
That pub guide is good. It should be noted that all the stuff about every pub legally having to close at eleven doesn't apply any more. The "last orders" ritual still exists, but it will occur at a later closing time.