Whsmith have instore a good selection of hardback recipe books for only £4.99 ot 2 for £7 (upstairs in store the 2 for £7 wasn't mentioned but downstairs they were labelled up as so).
They're just over A5 in size are are averaging about 500+ pages per book, there were books on veggie, meat,quick cooking, 3-4 ingredient cooking, baking, bread, asian cuisine, stir fry, low fat cooking, soups and other recipe books.
Ones I can remember were:
The Half Hour Cook by Jenni Fleetwood (next best £9.74 @ Tesco)
The Everyday Chicken Cookbook by Simona Hill (next best £11.49 @ Amazon)
Best Ever Three and Four Ingredient Cookbook by Jenny White & Joanna Farrow (next best £10.73 Whsmith online! )
400 Best-ever Fat Free, Low Fat Recipes by Anne Sheasby (next best £12.74 @ Amazon)