A bit of RTT platform matching suggests that it finished on 2N33 2328 Stratford (London) to Willesden Junction, then to 5N33 0013 Willesden Junction to Kensal Green Turnback. If we make the assumption that it joined up with the unit on 5N31 0006 Richmond to Kensal Green Turnback it would then go to Wembley C sidings on 5O31 0039 Kensal Green Turnback to Kensington Olympia, then 5M31 0101 Kensington Olympia to Wembley C Sidings Lorol entering via berth 002A.
I suspect 378206, as the number interposed in berth 002B overnight.
...but you may wish to check this for yourself.
See
https://www.railforums.co.uk/threads/non-urgent-tops-requests.202237/page-482#post-5555812 for a bit more information on the numbers in the stabling sidings.
As you will have picked up before, LO units don't show on the systems that people use to feed this thread.