The Independent Publishers Guild web site is a helpful web site if you are looking for information on publishers or signposting about getting published.
The IPG is an organisation for publishers rather than authors and supports around 480 members who have a combined turnover of £500m a year. It provides independent publishers in the UKwith information, practical advice and guidance to help them grow and prosper. They are also the voice for independent publishers in the wider publishing and bookselling industry.
You can search their database on line for information about publishers, which might then give you information on whether or not they accept unsolicited manuscripts. There is also a section on Getting Published that could prove helpful to you and a links page.