Foundry House, Milkwall =>Iron works ? Darkhill ? (General)
Glad to help. I've used the Library Ancestry site myself to search out addresses rather than people and it usually works, just allow plenty of time and pick a quiet time of day if your library computer's are as slow as ours can be !, and preferably not evenings when Ancestry is extra busy from the USA. I can't remember if the Library system allows searches of GPO phone books etc as the subscription service will, this may help too.
Yes, thats a great idea searching young George's attestation papers, or indeed any other Pension forms etc, having researched many WW1 soldiers meself, I really should have thought of that.
Good luck with it and, if possible, please keep us advised of your findings; you probably guessed I'm always rather keen on any mechanical engineering posts !
atb J