Did he say which one was most successful?
He told us the geologists were very successful at finding water. He didn't mention whether they had any luck finding pipes and electrical cables like dowsers apparently can.
Via the keyaero link that
betterfromabove posted, I found Shotton's obituary, from which I have taken these Western Desert passages:
Full obituary here:
https://royalsocietypublishing.org/d...rsbm.1994.0023