I'm pretty sure that Class 460s don't have route clearance to Blackfriars. If they had been there we would all have heard about it - the Gossip network ! (The closest they ever get is Herne Hill, as GatEx has a diversionary route out of Victoria to Tulse Hill & then onto East Croydon).
Like Dave says, I expect it was a 319, as the other units through Blackfriars at the time - Networkers, don't have a /4 subclass.
Hope this helps
FP (Ex Blackfriars driver)
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