All unis accept a huge range of lnat scores. Depending on everything else, you could get a place at any UK uni with an unbelievably low score (I mean below 20), while you might struggle to get an offer from the top four even with a score above 27. None will reject you just because of a score of 24. Of course the higher score the better, but don't think about it too much. With 26 lnat I got offers from UCL and from lse, but no offer from KCL!