On the few occasions recently when the Sun has shone my heather plants have been swarming with bees. I would guess they are coming from a local smallholding where there are lots of bee hives. They were making the most of a sunny period with the temperature reaching 14˚C.
I only saw one bumble bee. Usually it has been the opposite, lots of bumble bees and few honey bees.
They were not alone - seemingly basking in the Sun was this lone hairy caterpillar:
It appears to be the caterpillar of the Ruby Tiger Moth which feeds on heather, amongst other things. The adult can be seen here on the ukmoths site.
4 hours ago