I'd anticipate that the e200s may move across but perhaps not the Citaros or even the Versas. There's plenty of tat in the Arriva Southern Counties fleet that could be replaced by those.
Ideally, a short term lease on Leas Road whilst they obtain an alternative depot somewhere would be best. I don't think they can accommodate much more into Byfleet; in time, there may be some swapping about of routes; the 28/73 would seem more easily operated by a Guildford/Woking depot whilst the 436 does fit nicely with Byfleet's patch - coincidentally, four buses apiece.
Arriva may have done that but so did First with some of their sales. The issue is that you have fleet that is being depreciated at X rate and so is sat on the balance sheet with a net book value of Y. However, the incoming operator may not agree with that valuation, or would not want a load of non-standard but newish/mid life fleet and would sooner replace with their own vehicles.
Monitoring 'bus times' for the last few days, the PVR for Arriva Guildford appears to be as follows: -
Route A between 1-3 buses, varying on time of day.
Route 18 less than 1 (route is run with a vehicle sourced from other routes).
Route 91 PVR - 5
Route 34/35 (+134/135 schools) PVR - 10
Routes 36/37 PVR - 4/5
Routes 53/63 PVR - 6
Route 91 PVR - 5
Route 436 PVR - 3/4
Route 479 PVR - 3/4
PVR varies between 33 to 37 in Peaks & School times, less at other times.
I have not included route 47 odd journeys interworked with 91 or Route 28 1 journey.
Route 3 is a Sunday only tender.(Safeguard operate commercially other times).
Current Guildford fleet: -
1001 Merc Sprinter - crew bus but sometimes used in service.
2 Dart/Plaxton 8.9m - 1558 & 1563.
13 Merc' Citaros - 3891/3892/3893/3894/3895/3896/3897/3901/3903/3904/3907/3909/3910.
of these, 3892 believed to be withdrawn and 3893/3894/3896 haven't run in service recently.
11 ADL Enviro 200 10.8m 3984/3987/3989/3990/3991/3992/3993/4044/4047/4052/4053.
22 Optare Versa 2401/4183/4200/4201/4202/4204/4205/4206/4207/4208/4209/4210/4211/4212/4213/4214/4215/4216/4217/4218/4227/4229.
The 2 Darts were believed to have been temporary loans but now seem permanent.
Excluding the Sprinter, there would seem to be 42 serviceable buses to serve a max PVR of 37.
The allocations to routes are completely mixed, all types on all routes.
Can't claim 100% accuracy but must be very close!