The warm weather over the past few days has meant the bees are still very active with a lot of pollen being brought in. This is a bit surprising as brood rearing must be almost over for the year. Perhaps they are stocking up for spring while there is a good supply available.
At this time of year about 90% of the pollen comes from ivy. Ivy pollen has a high level of amino acids and the nectar is rich in sugar, 49% w/w.
The bees are still on guard against intruders. This wasp is probably a queen so I don't know if she was looking for honey or for somewhere to hibernate. Either way she was quickly shown the door.