Second vote for Biff's replacement inserts https://www.customduo.co.uk/Pitlamp-2-tone-Module/
A gift at £55.
Add a couple of 18650 cells wired in parallel from a laptop battery, include a 2A Polyfuse and you have a perfectly useable lamp for well under £100.
Met Pete many times when picking up a key for DYO and no matter how early or late, he was always cheerful and interested in what we were doing - usually with some good advice.
He was a member of WSG back in the day. RIP Pete.
Graham.