Hi, Amy, I love cookery books, and believe there are a few bookshops in the UK devoted to them - try Googling it.
Firstly, do your books have ISBN numbers? You'll need them if you want to sell copies through the bookshops, place them in libraries, and/or sell on Amazon. They can be obtained through nielsen bookdata
http://www.nielsenbookdata.co.uk/ who will then list the books in their 'new publications' catalogue.
Bookshops expect a 40% discount on retail price, and it will be up to you to do the legwork to persuade the independent bookshops to stock them. As for the major chains, you may be able to persuade your local branches to stock them if you offer to do a booksigning and arrange publicity with the local papers and the local radio. Unfortunately bookshops will usually only stock a couple of copies so it is rarely a cost effective option.
Far more cost effective to sell them yourself at farmers markets, food, and craft fairs, and keep the 40%. Try making contacts with organic fresh food suppliers - especially the ones who sell door to door or via farm shops, to see if they will add your book to their catalogue for a cut of the royalties.
Good luck,
NaomiM
<Added>One more detail. If someone orders your book through a bookshop quoting the ISBN number, the request will be passed to the wholesaler, Bertrams Books Ltd., who will contact your publisher (ie. the person or company in who's name the ISBN number is registered). Assuming that is you, you will need to negotiate a discount with Bertrams - around 20-30%. The bookshop will add a 'finders fee' to the retail price, since they have not negotiated a discount with you. Amazon add £1.99.