Its a while since I got their information but if you click on the single vaccines (email) link and send them the mail it will mail you back a list of places that offer single jabs - sorry if you have done this already. Otherwise ask other mums in your area - wouldn't bother with medical establishment as they are being forced to toe the party line on the whole, might be worth contacting your local NCT they may have some information/suggestions?
Hope that helps