I have been using mostly Tamiya acrylics for now. It works great for airbrushing and it is easily available in the UK.
I recently tried Vallejo Air acrylics and I was not impressed. Mild clogging and paint chipping.
For my VF-25S I wanted a paint that was more resistant to scratching, so I tried Mr.Color. I absolutely love this stuff, apart from the smell. It atomizes in the AB like nothing else and gives a great cover and finish. Unfortunately it is harder to get over here, but I will definitely try to use it on future projects.