Chiltern do have other depots aside from Wembley of course - including the shiny new one at Banbury that is only half its potential capacity at the moment - though not as handily located as Wembley for supplying trains for Greenford, which has become rather a ghost service since being truncated at West Ealing.
Though it might get a bit of a much needed boost when Elizabeth Line services start, it’ll never be cherry picked by any operator.
I honestly don't see why its so difficult to keep it in house at
GWR▸ , if driver Ted is really so bored with it, then maybe look at a new train or retrofitting a Class 165 to run automatically along the route.
It's not difficult to keep it with GWR it's just that it might have been more sensible to transfer to Chiltern (at least, that's what some stakeholders suggested). It turns out it probably isn't, and therefore GWR will continue to operate it in all likelihood, though I'm sure given the chance they'd have been quite happy offloading it to someone else. I'm a bit confused as to who Driver Ted is and why he is bored with it?
