Anyone know about a 737 at GLA?

There’s been a 737 parked outside the BA Maintenace hangar at Glasgow for over a year and a half now, in Aerolineas Argentinas colours, but with a G-B*** registration (can’t remember what exactly). It’s either a -100 or a -200 (again, not sure).

Anyone know anything about it? Only explanation I can come up with is it’s an ex BA plane (going by the registration, anyway), was to be sold to Argentina, but they didn’t have the cash when it came to it. I’m just intrigued seeing it everytime I fly.