Buses on loan

[BBS]

No, I don't know what you were looking at but BusTimes shows it as out on the 39 all day today, no mention of the 5:
https://bustimes.org/vehicles/tnxb-1805?date=2024-07-23

You must mean 1804, but even so, it has been nowhere near the AG 5 route today:
https://bustimes.org/vehicles/tnxb-1804?date=2024-07-23#journeys/608616709

Maybe last year that would've been true 

[Ingleboro261F]

Anyway why would a transfer to Walsall be loaned back to the garage that gave it away?

[WA4317]

850 returned off loan from WB

[Wba_lad]

Is 1798 a loan or transfer to west Bromwich 

[Tony]

Is 1798 a loan or transfer to west Bromwich

Transfer, replaced by one of the Tridents from Wolverhampton and to replace withdrawn 1795

[Twm 1990S]

7541 on 76/6143 on 18 on loan to YW