Hi Amos
Can't help, I'm afraid. My only Bev photo's are a couple taken in Khormaksar but no details remembered. Don't recall taking any during my time on 30 or 53 and I went to pastures new (Bangkok) in '61 - well, someone has to do the hardship postings!!
As I mentioned previously, I have the course notes from Dishforth which may have some tech details of use but will need a little searching-for.