Ive never had water refilling troubles with any other car, but the 1.2 seems a royal pain in the rear. My unauthodox method is to blow into the rad top while the bleed is open. Pressure on the radiator when the engine is off seems to work. It drives me mad, and they have all been the same. The TA seems to self bleed OK though. Once they have settled down they seem to be no problem only very tiny amounts of water are needed occasionally, usually after several nundred miles on the motorway. After my last cam belt I checked the water the folowing day and it took a litre to top up, so my garage must have also left a lot of air in the system. That car has been fine since. I would like to see how you do it as Im clearly doing something wrong, and others must make the same mistake. I will go much slower next time as you suggest.
