SAR, a very good book on instrument flying is Jeppesen's "Instrument Commercial Manual" (see, for instance
http://www.amazon.com/gp/product/088...Fencoding=UTF8)
It's probably the most detailed publication that goes through EVERYTHING. Unfortunately, as an American publication, it's heavily FAA-focussed and contains a lot of details on airspace and procedures that aren't really relevant in the UK. Nonetheless even for "JAA-only" flying I can highly recommend it.
If you want a more "gentle" introduction, you could try Rod Machado's "Instrument Survival Manual". Written in a funny and informative style, takes you through all crucial maneuvers at a meandering pace.
Then there's the Instrument Flying book out of the Trevor Thom series - highly recommended too.
Good luck,
KK.