From the newsletter of 'Lost Cousins', 19 November 2011:

'Derek Wilcox, who ran Blacksheepindex.co.uk, passed away suddenly last month, and although the site is still online I understand that there is nobody who can continue his work, and that his widow has returned cheques that were sent.'

https://www.
lostcousins.com/newsletters/latenov11news.htm