When you say he's collecting pollen, where's he collecting from? Have you any flowers out currently?
I've had one or two on the balcony in the last 3 weeks, though not in the last couple of days. There are some things in flower out there, but very little on the pollen front - too early.

He's a 'she' as only queen bumble bees hibernate over winter, the rest of the colony dies in autumn (at least that is my understanding). The weather has been so mild it might well have confused her, she is unlikely to survive.

Hi yes, "SHE" is collecting pollen from a hyacinth put out on the patio after it was past its prime. Well done M G ,the sexing of bees ,I have learnt something today.

lol

I have seen a few of the worker bees recently.

Am I correct that drones (male bees) are only born in the Summer ready for mating?

Yes the drones are only born in the spring and die off in autumn. But the hive keeps going all year round and with the mild weather we are having I would expect bees to be out and about.