On weekdays, this unit then usually works the next day's 2P09 0530 Redhill - London Victoria, which has the distinction of the only train scheduled to be a 455 from Redhill, as well as the only train from Redhill which calls at all stations from Coulsdon South to Victoria.
Unfortunately (especially as it is fairly well used, even from Redhill), this service has been cancelled quite a few times lately. When it doesn't run, the stock is often left in situ until the next morning. The unit is generally cleaned overnight and other than that, it always seems quite happy sitting there, if a little chilly on a cold morning!
Because it starts at Redhill and berths there, it is especially useful if the very early morning services via Redhill from further down the BML are disrupted in any way, because it is not usually affected. This may change, as follows...
Soon the Post Office Dock at Redhill (not really Platform 4) will be completely signed out of use, so the unit will originate from Three Bridges, where it will berth overnight instead, and will start from Redhill after travelling ECS. At the moment the Dock is only really capable of being used by 4 coach 455s, as it's no longer cleared for 377s and the conductor rail can't accommodate longer trains, so it only has "niche" uses (quite literally really, if you think about it!)... this does add extra vulnerability to an extra morning service from Redhill, though, as it means it could be affected by any problems between Three Bridges and Redhill.