Why move 637? Because 612 are being disbanded. Suggest you read the announcement...
I have read the announcement, I've also read the letter sent to all the VGS staff. They're out to disband 14 Squadrons at 14 sites, so why disband one and then move the surviving one to the site of one that was disbanded - although on the evidence of the past two years that is the logic they would use.
Rissy has just had a fortune spent on it Abingdon hasn't its a simple decision for the bean counters.
As Leon has pointed out there are plans to move a skydiving outfit into Abingdon that combined with the proposed southern enlargement of Brize Zone the PPL community in this country will not be happy as the Brize / Benson gap will finally be closed.