Jackonicko,
Further to your bomb bay tank fit, the BS ac could carry two extra saddle tanks. These were the A-tank (front) and E-tank (aft) IIRC th ecapacity of the A-tank was 5600lb with the E-tank being very similar. Both tanks were contoured to accommodate the BS indented bomb bay.
Later, I can't recall the date but between 1966-1968, Avro made the Drum tank. A drum tank held 8000lb of fuel. The bomb-bay could accept a fore and aft drum and the WE177 in the middle. This gave the aircraft possibly a further 300 miles range for the strike mission.
It could also have carried 7x1000 lb HE as an alternative. With one drum it could have carried 14x1000 lb.