It´s a Weevil. I think these green weevils can be quite difficult to identify from photos but it probably belongs to the genus Phyllobius.
Here´s some photos:
Thanks for your response Samuel J. Am trying to combine my interest in photography with a growing interest in trying to find out what insects are on 'my patch' and am beginning to appreciate how diffcult identification can be.
You can distinguish between Phyllobius and Polydrusus by how the antennae attach to the head.
This discussion includes marcello's excellent photo of a Polydrusus
See also Max's and Clive's discussion of Cypress weevil, Pachyrhinus lethierryi
In general when photographing specimens for ID, I suggest you take many more photos than you might like to from an aesthetic point of view. That way, you stand a chance of capturing views of what could turn out to be key points in identification.
I meant to add a few more links:
- and I thought I had a link to a PDF version of Mike Morris' key to these green weevils,
but I can't find it