Not sure what he's doing now, but Alistair Cook was a groundschool instructor on the RW side when I attended ETPS in the mid 90s - as with Eric, nice chap, knows his stuff, explains it well.
The book you're thinking of is I believe "Flight Testing Homebuilt Aircraft" by Vaughan Askew. Excellent book on the practicalities and safety aspects, rather short on the data gathering and certification aspects - complements Stinton very well in that regard, which is arguably the opposite.
G