47239 & 43033 Shrivenham (Ashbury Crossing) 29 May 1986

One of my very few pictures of locomotives hauling failed HSTs. 47239 approaches the site of Ashbury Crossing, near Shrivenham, on 29 May 1986 with an unidentified westbound working. This could possibly be the 1C69 18:28 Paddington to Bristol Temple Meads service, or if there was any kind of a delay in attaching the 47, possibly an earlier working. Confirmation anyone? The errant HST has power car 43033 leading.