A friend told me that there were three Aurigny ATR's sat on the ground this afternoon (2 x 72 1 x 42) the leased example was flying to/from LGW.
Aurigny currently have one more ATR in the fleet than at the beginning of December G-OGFC arrived to replace G-VZON which is still in service so I do not think that the leased ATR is to cover the Embraer which is away on maintenance. If I was a betting man I'd place my money on ATR crew shortages.
If there are any GR bods reading this they may like to comment....