After rereading this thread, Evening Telegraph article and the Moncreiff Company records, there requires a few updates on dates and people who worked at Moncrieff's.
Chic Young started at Moncrieff's on the 31/3/47 (not 1946), left to do his National Service (can't find a date for that as yet) returned to Moncrieff's 14/4/52 and finally left on 30/3/62, one week before Paul who left on the 6/4/62 (Moncrieff Company records).
Frank Eisner was 69 years old in 1958 (Evening Telegraph) that would mean he was born circa 1889.
John Smith assisted Paul Ysart along with Chic Young in the Monart workshop (Evening Telegraph), John Smith worked at Moncrieff's from 24/4/56 to 28/7/66 (Moncrieff Company records).
Bernard Wade made glass swans while the reporter was at the factory doing the article (Evening Telegraph), he started at Moncrieff's on the 3/2/1958 (Moncrieff Company records).