Is that likely to be another unit about to enter passenger service?
I guess the move from Farnham today and the one from Eastleigh yesterday means space must be being made available by two earlier candidates getting into service (already or VERY imminently).
I note neither made it to Wimbledon under their own steam so they themselves are unlikely to be entering passenger service very soon.
These two moves suggest a drag from Bicester to Wimbledon of a pair of 701/5s is not likely soon.
Afterthought.
It is about time another 458/5 was ready to leave.
(so that would free up space at Wimbledon)
How soon for a 458/4 to go as well given the low number in use (14/28 iirc) ?.
(so the 458/4s are obviously giving up services for 701s and up to 14 are filling sidings)
The above thoughts perhaps apply more to 701/5s getting used.