XG196 was definitely an F6 whilst at Chivenor - it is in my logbook as such in 1969. It was converted to F6A for its time at Brawdy where it was still alive and kicking with tail no. 25 in 1981 when I last flew it there. At Brawdy F6/F6As had tail numbers whereas FGA9s had tail letters which is one easy way of telling them apart in photos.