According to a car check web site there was a keeper change in Jan 2015.Looking at Flickr there does not appear to be any pics of it since 2014 when it went on the HCVS London to Brighton Run. 20/10/17 Silcox Fleet List I am on the hunt for any fleet list for Silcox of Pembrokeshire, preferably all-time, but even partial would be useful in conjunction with the extensive list of my own.
Newcastle Haymarket Bus Station, probably around the mid 30’s.
Eastern National, United Counties and Luton Corporation were separate bus operators.
The book also tells that Eastern National had had a working agreement with Luton Corporation since 1932 (the Luton and District Transport Agreement).
The only bit of further information I can offer is that the 1956/1957 issue of the ‘Little Red Book’ shows United Counties as having a fleet of 486 buses.
If one deducts the figure of 247 that came from from Eastern National it gives 239 – so your point about doubling the fleet would certainly be the case.
He is in a newspaper clipping in 1950 for winning silver award for from the Eastern Bus company and the Royal Society of prevention of accidents.