Wingo, I'm not trying to pick a fight here, but the Jethros website (which is normally very accurate) is showing five Q400s as parked up - G-JEDP/R/T/U/V either laid up in Exeter or Norwich. Admittedly they may be lease returns, but "sourcing" extra Q400s when there appear to be five dormant looks a bit strange to me.
With Brussels Airlines moving back towards E145 flying with bmi Regional, two Q400s are coming back in April and the remaining two in October (per their latest prospectus).
All of the available information would therefore suggest that the five units for LCY are not "new" additions to the fleet but either parked aircraft or those exiting wet-lease contracts.