Nigel,
What to recommend from Walker's writings? Well anything and everything you can get your hands on
One of my favourites is "Drop Me A Line" which chronicles his correspondence with Maurice Ingham over quite a period of time and which to me, demonstrates Walker's absolute generosity with his time, his knowledge and his vast expertise on many subjects.
I must have read this book literally dozens of times and I have a copy on the coffee table in my apartment here in
Holland as I write.
One of his smaller book(lets) is; "How Fish Feed" and although written a long time ago it is as current and useful now as when it was written.