I came across this page the other day. It’s not very user friendly because it just lists the breweries for each county by name. I went to the brewpub in the bowling alley at Bracknell back in the day but had not realised how many brewpubs, etc, there were around in the late 90’s/early 00’s but I was barely out of nappies. Three in Woking at on point. Not sure when Ratebeer first started so possibly a number that never made it on to here back in the day.
http://breweryhistory.com/wiki/index.php?title=Category:British_Breweries_by_County
Also, being CAMRA oddballs they refuse to recognise modern county boundaries.