You may have a better chance of reaching him if you email RNIB and talk to them (a last name, a geographic area, a job title or what he does may help them narrow down who he is and what his e-mail address is). They seem to be broken into four different sections, so I included the e-mail for each country.

England: helpline@rnib.org.uk

Northern Ireland: rnibni@rnib.org.uk

Scotland: rnibscotland@rnib.org.uk

Wales/Cymru: cymru@rnib.org.uk

(I'm not really sure what Cymru is, but that is what the name says)