This is a question being asked by Stephen Carlill after corresponding with the Leader of Lambeth Council, Lib Peck. Stephen responded to a form email Cllr Peck sent out, received a reply from her and wrote again. The correspondence is here. The letter from GLL, which the Leader calls "the most credible proposal," is here.
Stephen is Vice Chair of Friends of Carnegie Library. It should therefore be mentioned that although the Council Leader was writing in her official capacity Stephen was writing in his personal capacity. If he expresses opinions, rather than merely pointing out facts and asking questions, the opinions are not necessarily those of the Friends' committee.