FasterS
For Summer 2013 there is one based unit in LPA but this increases to 6 or 7 for W13/14 plus an additional 2 units in TFS, so 8 or 9 units in LPA/TFS in total with based crews.In addition many flights to the above start from the Nordic countries using local crews. W13/14 see's a significant jump in rotations compared with last year on peak days there will over 35 aircraft arrivals, this taken from the Norwegian.no website, but this does not show the whole picture for winter yet and there are charter flights on top of that which will add at least 5 movements a week.
So yes some crews will be based moved to the Canary Isles to over winter, most likely from AGP/ALC/LGW when the summer Med stuff winds down, there are less aircraft deliveries planned in 2014 (8 B738 I think) so only around 3 or 4 courses starting August/September with more in Jan/Feb and the A320Neo's start to arrive in 2015/16 followed by the 73MAX in 2017
Norwegian have a new larger check in area in J block at LGW and Are Lingus have taken the old Norwegian check in desks between the twin walkways