Bees carrying pollen in early March

The bees have been out in force today. Although there is still a cold chilly breeze it was beautifully sunny and by lunchtime the temperature was around 10 degrees. I heard them from about 100 meters away  - something I dont remember experiencing since the heat of mid summer.  And sure enough, there was a big cloud of them milling around both hives and a carpet of them covering a fair portion of the hive front.  They mainly seemed to be basking in the sunshine.

Plenty of them were bringing in pollen of several different shades. I spotted a very pale buff or cream, light yellow, bright orange and a dark orange too.  Having checked the charts I think these will include hellebore (cream) and crocus (dark orange). I am also seeing them on the tiny little speedwell flowers but cant work out what pollen colour that has.  Any suggestions welcome.