My daughter has applied for Liberal Arts (though chose Combined Honours in Social Science) at Durham, but applied for Manchester, Birmingham, Nottingham and Exeter. The one with the greatest flexibility I thought was Nottingham, listening to the presentation on the offer holders day.
Birmingham is interesting also as it's Liberal Arts and Science and has a wide range of courses. From my understanding you can pretty much pick modules from any courses other than medicine and engineering. It's a 4 year course with a study year abroad.
Birmingham's offering seems quite unique - the only other one offering Liberal Arts and Science seems to be UCL.
My daughter hasn't firmed anything yet - she was thinking of firming Durham (A*AA) and insuring Birmingham (AAA) but Birmingham muddied the water by recently offering her AAB if she firms them.
Are you applying next year?
My eldest daughter is a first year at Birmingham doing Psychology but went along to the offer holder's day with her younger sister and now wants to swap onto the Liberal Arts and Science program at Birmingham as she was so impressed.