A Valiant yoke looks like this:
It is definitively not a VC10 yoke either. The R/T and I/C switch does look like the ones on VC10s and Vanguards, which makes Viscount a likely suspect, apart from the logo. Perhaps those switches were common across various British airliners in those days. Has anyone looked at an Argosy yet?
Edit: And how about the Viking family? Including the Varsity and Valetta? I have a feeling there should be a brake lever behind the yoke on those ones, but there may have been differences there too.