oh and kate holliday also used to program with the 'delay storage'...whilst pointing to a map of 'leylines'...somewhat reminds me of a doctor/professor that my mother used to know, in b'ham...who had a computer program of every leyline in the UK...and was calculating 'something' as a result...anyway, edsac and delay lines - are on my youtube frontpage, today...go figure:

https://www.youtube.com/watch?v=TjDOo-Mwfl0