Probably more likely to than Imperial. There is also the issue they accept Welsh Bac when Imperial dont so might accept you with A*AB whereas with Imperial they are looking at ABD. Your best option will be to look around for universities that will be in clearing that accept Welsh Bac and if you get rejected by ICL and UCL then you will be ready to proceed to find another option. Bristol, Cardiff, Manchester and Nottingham are all worth looking into if you want the big city environment and places like Bath, Southampton and Swansea are smaller cities with campus universities. A lot depends where in Wales you live and whether you think Cardiff, Swansea, Bath and Bristol are too close.