Actually - thinking about it - I think the Silver/Red/Dayglo scheme must have started in the early 60's.
I joined the ATC in 1966 and I do not recall seeing a single 'In Service' aircraft still with the Silver/Yellow scheme.
Here is a lovely pic taken by H John Black at Gaydon in 1966,including a link to his Abpic page which has some lovely colour shots from the 1950's onwards.
https://abpic.co.uk/pictures/photogr...oved&order=asc
