Most Unis will not ask for any specific A level subjects for Law - they just want mega-high grades.
If they do 'prefer' certain subjects they have to be up-front about this and say so; the days of admissions 'secrets' are long gone.
Bristol, for instance, does not specify any subjects for Law and doesn't have any interest in 'facilitating subjects' across the University. Each course page on their website will tell you exactly which A levels and/or BTEC subjects and the GCSEs they want.
However, if you have done a typical essay-based subject like History, Politics, Sociology, English Lit etc, you are more likely to have the immediate essay skills needed - and you will find LNAT easier. This wont automatically help you get a place but it will make starting the degree easier - there is a great deal of reading, and essay writing is an essential skill that is at the core of a Law degree.