On 27/05/2017 17:17, Chris Hogg wrote:
On Sat, 27 May 2017 16:45:10 +0100, ARW
wrote:

Thanks for that. They are nesting in a "Robin" bird box ie one with a
letterbox shaped entrance.

Hmm...could be honey bees, but they usually size up the space
available and go for something rather larger than a bird box. I'd
guess bumbles.


Bumbles was also my Dad's suggestion. He is happy to leave them alone -
just let nature be as it should be.

--
Adam