utodd, I didn't see you question until now.
I got the facts like this:
Studio One (13 Brentford Road) opened in 1963 with one-track equipment.
Upgraded in 1965 to two-track and later on to eight-track.
Justin Yap recorded there in 1964 and 1965.
He recorded at least into 1966, and in 1967 he migrated to he States.
// Crazy B