Again, the
Countrybus website has more on (Telings) Golden Miller's routes around Feltham.
To reply to a few comments - travelcards and bus passes weren't that much of a thing until the early / mid 1980s (other than the 'red rover' day ticket which as far as I can remember wasn't valid on other operators' services) so before then, it wasn't really an issue.
London Country had a number of routes that came a long way in to what is now Greater London - the green bus / red bus dividing lines established in the 1930s didn't quite match the 1965 Greater London Council area - particularly round the Dartford / Bexleyheath patch where current routes including the 401, 428, 492 are derived from former LT country area / London Country routes that got absorbed in to the London Bus network in 1988 when the 'Bexleybus' thing happened. I think the Orpington - Ramsden Estate 493 was unique in being wholly inside Greater London, though.
Similarly, there were a lot of red bus routes that largely fell outside Greater London in the south west corner, although the original plan for the GLC had included boroughs including (what is now) Spelthorne and Epsom, but they resisted joining Greater London.
There is a Capital Transport book 'London Transport Connections, 1945 - 1985' about the non LT routes coming in to the LT area (believe it's out of print now, but bit more info
here - other retailers are available.)