Guernsey - Southampton has had disruption on some days as they have been moving the aircraft over to Jersey - at various points I have seen the Aurigny ATR operating the afternoon flights, some flights totally cancelled and Aurigny laying on their own flights, including with a Dornier at some points for the customers who had booked direct with Aurigny.
I think there was one night also where they used one ATR to operate SOU-GCI-SOU in the middle of the evening JER-SOU-JER rotation, and I have also seen what would be the Guernsey-based aircraft flown out after its evening Southampton run when it has operated so that it is in Jersey to operate a red-eye the following day.
The 5-6pm inter-island rotation also operated after 10pm on at least 2 days last week... the aircraft that is currently out of action was also sat broken down when I went through Birmingham on 30 June