803 squadron had reformed at Lossiemouth on 3 July 1967 as the Buccaneer HQ unit. On 18 Aug 1968 it despatched a flight of 4 aircraft to the Far East via Nicosia, Masirah & Gan with the assistance of aerial refuelling. They reached Hermes on 23 Aug. They are also recorded as being at Changi, Singapore on the same date, 23 Aug 1968. So the visit to Hermes can have been no more than a refuelling stop and the aircraft were never formally part of her air group..
They left Changi on 28 Aug 1968 and arrived back at Lossiemouth on 1 Sept 1968.
Information taken from "The Squadrons And Units of the Fleet Air Arm"
The same source gives 809 as reforming on in Jan 1966 with 6 Buccaneer S.2, "later increasing to eight aircraft". It embarked a detachment on Hermes between 6 & 9 Sept 1966 before the whole squadron embarked on Hermes on 18 Jan 1967. It finally left Hermes on 18 Feb 1968.
801 squadron reformed in Jan Oct 1965 with 12 Buccaneer S.2 for service in Victorious. However on the move to Hermes it must have downsized but unfortunately that source doesn't say to what figure. It first went aboard Hermes on 31 May 1968 and finally left the ship on 17 June 1970.