BA, Ryanair, Easyjet, bmi, bmi Baby to name but a few. 130 cancellations in the UK throughout the day according to the radio.
It is my understanding, that certainly on the 146 and I imagine the Dash 8 as well, that Cat 3 operations cannot be performed, same with virtually every other regional aircraft in the UK. The only landings taking place at MAN today were Cat 3, which meant only the bigger stuff was making it in.