Susan: do you know you can have a guide for the BM? If you state your interest, that guide, after knowing your situation, can even let you have a hands on with some of the exhibits. When I was putting my assesors through torture at summer school last year as part of my Egyptology degree course, not only were we let loose in the conservation area, but we had the supreme jioy of hands on a lot of the exhibits in the Egyptian hall after hours. Some of those items can be handled with permission by visually impaired folk under supervision. Why not make enquires?