This one is booked 153 though it can throw prety much anything up depending on whats available.
1008 Westbury - Warminster
1025 Warminster - Westbury
1111 Westbury - Southampton
1227 Southampton - Great Malvern via Bristol
1649 Great Malvern - Southampton via Swindon (1 153, however another booked to join train at Gloucester (1750) as far as Westbury, usually the 153 thats "hot spare" at Gloucester most of the day)
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This one is booked to have a 150 + 153 on the train most of its journey though it can attach and detach where required (it has been taken off/put on at westbury/bristol/gloucester depending on if there is a unit shortage.
0524 Westbury - Salisbury
0604 Salisbury - Westbury
0638 Westbury - Gloucester
0842 Gloucester - Weymouth
1310 Weymouth - Gloucester
1642 Gloucester - Weymouth
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This is booked to run 143 or 150 or 153 or 158 (usualy 150/1 or 153, always 153 on a Sunday)
1932 Westbury - Cheltenham via Swindon
2200 Cheltenham - Swindon
2333 Swindon - Gloucester
Hope this helps
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Thanks for that. Looks like Devon and Cornwall account for the majority of diagrams, but as you say they operate over a very wide area.
EDIT : not sure how my post appeared twice.
1910 Taunton - Bristol, all stations then ECS