Good shout Toby, i have the first two and they provide lots of ideas, nothing ground breaking but small twists that can make all the difference. Also if you are a hook anorak they use some uncommon hooks again which only adds to your armoury. A bit off tangent but what i found interesting about both books is how they recommend small nymphs for grayling and larger for trout, something i have found very true when targeting better grayling. Having said that as an experemnet i caught a Grayling last week on a size 4 Pink Charm
The third book listed is now on my Xmas list.