I was looking through Google for Glibbery Transport,recently and spotted your entry.I was born in 1921 at Mile End and your Father Sydney was my Cousin.Since your query was 1n 2002 I wonder whether tou have finished your research.I also can only go back to Joseph and Sarah Peck. I think the reason for this was because of the French connection i.e. Hugeonots. The archives of the French Hospital which used to be located at Victoria Park,Bethnal Green showed some Glibbery inmates. The names Sabourin and Bellet,come up somewhere.I wonder if this is the missing link,prior to Joseph.
I know this is rather belated information,but it may be of interest.