Welcome Alex from this neighbour in S. Holland. #533 is known to be a nice car; congratulations!
If you do get any more problems withe the A/C (and almost everyone does, sooner or later), there's a lot of info here as how to really fix it (from Nick at Austin Garage), or bypass the problem and always get cold air on demand anyway. All will be revealed when your full membership comes through!
P.S. I pay Euro 1044 (about £950) per annum road-tax for my Rover 75 V8 here in Holland, with bit less kerb-weight (1680kg) than your ZT-T (1770kg), if weight is a factor in Belgium as it is here.
David