Thanks for the replies
,
Looking at Paul's chart it seems that I have the 1958 6th edition:
Vol 1 - pre 1953 radio
Vol 2 - pre 1953 tv
Vol 3 - 1953-54
Vol 4 - 1955-56
Vol 5 - 1956-57
Vol 6 - latest models (1957-58?).
I wonder what happened to 1954-55? Anyhow I've looked at Jim Beacon's list and it seems my version is lacking in pre 1953 data
, I guess I'll have to look out for an earlier version
Many Thanks
David