Mister C who is not an RM Web member has asked me to post this :
This has come to my attention and I can provide the answers from the book of arrivals and departures of trains at Bristol Temple Meads May 1973.
4O22 was 1150 Bristol Temple Meads to Salisbury parcels (there was also a 4O21 dep 0430)
6B07 was 1547 Paddington to Bristol Kingsland Road parcels, the loco ran onto Bath Road as 5B65 if conveying any enparts vans.
2V61 was 1005 Weymouth to Bristol which was a hauled train hence appearing in photographs.
The DMU Weymouth arrivals at Bristol were 0554 2V55, 1215 2V63, 1605 2V67, 1745 2V70.
1930 ex Weymouth was also hauled and was 2V72.
The only Westbury starters were 0630 2B10 and 1635 to Severn Beach 2B51 (all Severn Beach trains were 2B51).
Hauled trains to Weymouth were 0535 2O51 and 1600 2O60.
DMUs to Weymouth were 0808 2O53, 0905 Cardiff 2O56, 1208 2O58, 1745 2O61, 2008 2O62.
Other trains you may want to know about were 1240 Bristol-Yeovil parcels 4B15 returning as 4B16 1610 ex Yeovil and 1722 Portsmouth-Bristol parcels 4V30.