We publish only a handful of books a year, many of which are reissues, and only books we fall heads over heels in love with, so frankly your chances are slim, and you're very likely to get a (hopefully mercifully quick) no. The worst part of our job is turning down perfectly good books, but please appreciate that we get offered lots these days and can be very picky. But we know how it feels to be rejected (see Martin's essay on the publishing business in The Guardian here, or The Agent page).
Our specialist areas are psychology, pregnancy, childbirth and breastfeeding and yoga. Please do not send us proposals which are miles removed from our list (please check out what we publish before you get in touch). Even if you are the new JK Rowling, please don't send it to us - we're not the right publisher for you, any manuscripts featuring wizards or goblins will be rejected straight away, even if you somehow managed to make them childbirth or psychology related. To get addresses of publishers in the UK suitable to send your work to we recommend the latest edition of Barry Turner's The Writer's Handbook.
If you decide that Pinter & Martin would be a suitable publisher for your book, please send Martin Wagner the whole book, or an outline with a few chapters by email or post (please include return postage if you want your material returned). It may take a while to get back to you, but please feel free to email or phone if you haven't heard from us in a few weeks.