1/ Don't know about the on-board service on the ERJ on Heathrow-Aberdeen. However the airline seems to be increasingly cutting its costs to hold slots at Heathrow - it is the only one now regularly using 50-seat jets into LHR.
2/ The fixed A330 is going/gone to Virgin Nigeria until May when it is being replaced by the two 767-300s that Astraeus will fly for VN. Its return seems to tie in to bmi's return of the Arkefly 767-300 and so presumably it will just take over the LHR-Saudi flying.
3/ DME - 60 is a good load, 40 is a bad load. Not setting the world on fire, but then you never quite know what the average ticket prices are. It might be their most profitable route if the fares are high! Still rumours of using A319s on Dammam. If they are going to operate Jersey, it looks as though they would need to pull off something (Heathrow-TeesSide?) to free up the slots.
4/ Airbuses released from the Heathrow ops by the ERJ will displace A321s slowly being phased out plus the one A320 operating a full-week charter programme from Leeds this summer for MyTravel.