Not really sure on this but you may have a Plasterer Bee here, possibly one of the Hylaeus species!
Shane
Agree with all 3.
Shane
Not the best photo I've ever taken, but hopefully this is enough for someone to tell me what this is?
It was by a pond in north Wiltshire, with a hawthorn hedge and mixed woodland nearby.
Thanks, Aeshna,
Here's another photo. I don't like it as much but perhaps it shows the parent bug better.
'Stink bugs' is a common name for those in my area, our households keep infested by those regularly.
It's a female bug which is obvious, not only because of eggs but the size and the shield shape. It also seems like a brown marmorated bug for me, check this article if you want to compare. If it's in your garden I would recommend if not whacking it, but to transfer somewhere else, to the nearest forest maybe.
Thanks Andy. You must have a massive library/link list:t:B