In 2010, RLUK and The London Library undertook a survey of ‘Hidden Collections’, with the aim of providing evidence for the further need to fund increased retroconversion in the UK, across sectors. Looking at a broad range of holdings, not only bibliographic, the survey has produced some interesting initial results.

Responding institutions, of which there were 77 in all, included amongst others Public libraries (9%), University libraries (40%), and Museum libraries (12%). 59 institutions were able to provide figures regarding the number of items in their collections awaiting retrospective