I make it thirteen 701s that are floating around SWR - mostly London.
701001,
701002,
701004,
701009,
701015,
701020,
701024,
701026,
701027 (Eastleigh),
701040,
701054,
701059 &
701060.
That is 50% the size of the fleet in service. So there must be some ready.
Even if say 50% of the above are not ready I suggest there would still be six available by now. So either things are really difficult commissioning wise or it is drivers / groups-of drivers. OR hopefully the number of units dedicated to driver training is boosted to allow an increase in driver training (post summer holiday season !).