Ah - you probably didn't see my original post on this, which on advice I made private until the copyright situation was sorted. Philip Larkin knew my mother quite well (her cousin was his fiancee for a while), and she has a number of letters from him stretching over some four decades, which we were thinking might be made the basis of an article for the TLS or similar. In one, from the mid-60s, he mentions this novel, and asks if she's come across it.