I wouldn’t be so sure the Swanwick controllers are happier now than when they could live near London. Obviously it suits some, but career opportunities for partners and children are still quite London-centric. Moving away from West Drayton was supposed to facilitate cost savings, but Swanwick always seemed an odd choice being a very expensive edge of the country.
Good luck to the Sydney staff for the years of disruption and moving time-lines ahead of them.