I would suggest you track down a copy of The Writers' and Artists' Yearbook, which lists all publishing houses in the country. You know your book better than anyone here, so you'll be able to choose potential publishers yourself
Suggest you get yourself a good editor, too. If you can't spell 'novel' or 'suggest', you aren't going to impress a would-be publisher beyond first glance.
You could get hold of a copy of The New Authors' Handbook (0 7206 1101 6 �12.50), which gives potential authors an idea of how to approach publishers. See also the article at article 947