NQY isn't such a strange choice to store aircraft, theres plenty of hangar and HAS space available for short and long term, I think Netjets had or still have a decent sized fleet stored @ NQY, certainly when the downturn was at its worst they did.
Also Flybe have previously used NQY to store aircraft, they had DH8 G-JEDN for a while before she went onward to Aerocontractors, displaying JEDN but in Aerocontractors livery.
On the subject of NQY-SEN on BE, its the first iv heard of it but it wouldn't surprise me. However, unless its going to be at stupid o'clock would that not require a 2nd based aircraft or an aircraft doing a W pattern ?
Currently for summer 14 the based aircraft will operate NQY-LGW-NQY-BHX-NQY-MAN-NQY-LGW-NQY so cant see its got scope to go SEN as well.
cs