Thanks Lloyd, I've been thinking for 65 years that 486 was one of the bus converted for gas production, but I'm prepared to accept your word [I certainly remember it before and after 'rebodying' by Brush]. I agree BCT had no wish to get involved in the 'experimental' use of gas producers and, to be fair, the idea had not been tested - in times of war many odd thingsd are done in desperation.
The bus companies seem to have been more willing. I can remember old IM6s running with gas trailers, especially on the 165 to Coleshill, and the 148 to Evesham. Also BHA 9407 on the 159 - and sometimes I seem to remember, on the 118. I understand Banbury garage had several too.
I went to Bournemouth in 1943, and spent hours hanging around the parking space at the back of the H&D bus station, where the gas buses were victualled and serviced. They were mostly old TD1s or TD3s, I believe, some with a 'new' utility body, but my treat was to see the hourly Wilts and Dorset bus from Salisbury, always looking very exhausted after that long trip.
Peter