I was at Paddington all day on 26.08.82 and can confirm that the 12.40 Padd-BTM and 15.25 return were worked by 253 006 formed 43012/152, 41013/14, 40353, 42020/18/19, 44006. I also noted 47513 which worked the 07.28 Oxford-Padd. I recorded the working quite closely that day, and it didn’t appear again until the evening peak when it worked an ecs from OOC. I don’t have a record of it working any other down service thereafter.
I don’t currently have access to the 1982 volumes of Rail, Railway World, Rail or the Railway Magazine but all would be worth a look. I have checked the relevant 1982 magazines of the LCGB which has no mention of 47513. The October 1982 edition of Inter City (ICRS) records that on 28.08.82, 47513 worked the 09.42 Poole-Newcastle/09.50 Newcastle-Poole south of Birmingham, so this would seem to rule out that date for your trip. Unfortunately, I don’t have access at the moment to the 1982 volume of the Railway Observer, but the October, November or December 1982 editions may be a potential source of information. Perhaps another forum member who has the relevant editions could look them up for you, if you don’t have copies.
In regard to the Timewarp website they host a page detailing individuals’ requests for haulage information. You could perhaps submit a request to them. I have done this myself and found them to be very helpful.
Hope this helps.
Commoner