Dorniers
Following an extensive airtest and return to service on 23 November, G-SAYE appears to have had further airtests on 29 & 30 November. It now has an EASA ARC dated 30/11/2017. Are there ongoing issues with this aircraft? It isn't in regular service.
Meanwhile the "reliable" G-OAUR has not flown since 14 November. Its EASA ARC is dated 22/12/2016. Is it undergoing work relating to an updated C of A?