I'm not sure if this is any help but a record of an interview he gave in 1980 which may have incorporated his views on the subject is referred to in this document http://209.85.229.132/search?q=cache:XxO6ATPZDhsJ:www.bl.uk/reshelp/findhelprestype/sound/wtmusic/wtmeurope/europe.pdf+bob+daven

(Apologies for the VERY long link.) The interview is catalogued there as "C 1047"