I have this on inter-library loan (although it's been on my wish-list since last year - hmph!), and wished I had saved my £6.10 borrowing fee because I am now going to buy it! Stupendously erudite, very well organised and indexed, this will surely remain essential reading and reference for many many years to come, hopefully with updates as new material is discovered, and will doubtless raise many fruitful debates. Would make an excellent companion work to P. Schrijver's 1995 "Studies in British Celtic Historical Phonology" except that that work, only about 100pp longer, is practically unaffordable at £90.00. Thank you Blackwells and the Philological Society!