Listmania!
The Writer's Essential Bookshelf
Techniques of the Selling WriterTechniques of the Selling Writer by Dwight V. Swain
Buy new: £8.47 / Used from: £18.27
Probably the best book on writing out there! Timeless advice!
Writing the Breakout Novel: Winning Advice from a Top Agent and His Best-selling ClientWriting the Breakout Novel: Winning Advice from a Top Agent and His Best-selling Client by Donald Maass
Buy new: £4.96 / Used from: £13.02
Excellent! And the Workbook (see below) is even better!
Writing the Breakout Novel Workbook: Hands-on Help for Making Your Novel Stand Out and SucceedWriting the Breakout Novel Workbook: Hands-on Help for Making Your Novel Stand Out and Succeed by Donald Maass
Buy new: £6.55 / Used from: £5.16
A fantastic guide to help you ask the right questions of your manuscript.
Dialogue: Techniques and Exercises for Crafting Effective Dialogue (Write Great Fiction)Dialogue: Techniques and Exercises for Crafting Effective Dialogue (Write Great Fiction) by Gloria Kempton
Buy new: £4.92 / Used from: £8.37
Yes, there actually IS a good book on dialogue! And this is it! (Amazon have wrong cover pic)
Self-Editing for Fiction Writers, Second Edition: How to Edit Yourself Into PrintSelf-Editing for Fiction Writers, Second Edition: How to Edit Yourself Into Print by Renni Browne
Buy new: £3.53 / Used from: £4.31
Invaluable once you've written the first draft. Solid and practical.
No More Rejections: An Insider's GuideNo More Rejections: An Insider's Guide by Alice Orr
Buy new: £8.74 / Used from: £4.33
Solid advice and written in a fun, user-friendly manner (with exercises)