fast cruiser,
It's been up in MME for the last 5 summers that I know of. There is also one at LBA. Some of the pilots are qualified to fly their Airbus 330 that arrived in MAN last winter (and returns this), so are resident in the UK year round.
Next summer two additional C reg A320's arrive in NCL, displacing the NCL based Airtours A320 pilots, who will now spend next summer in the back of taxi's covering other bases.
Since Roots, a schedule airline based in Canada that is an affiliate company to Skyservice who own the A320 you saw in MME, is no longer in operation, they now have 3 x A320, 2 x A330 and 1 x B727 surplus to their requirements.
Expect to see more C reg in the UK in future.