What is eating my climbing hydrangea?

I planted a climbing hydrangea (dont know the proper name but its the very common one with big white flowers) against a very shady wall in early summer. it did really well, grew lots! But for the past month or so something has been nibbling at the leaves. Also a lot of un-nibbled leaves have been going brown and curling.
It gets watered and fed well and I cannot see anything at all on the leaves, no greenfly, no caterpillars etc. I am a bit of a gardening novice so am not sure if it is something blindingly obvious.
Anyone got any ideas what it could be and what I could do to help it? I did spray it with standard kill-all bug spray to no effect.
Thanks
nicola

 

Nic hydrangea petiolarisis is the climbing hydrangea I had exactly the same problem i think if you go out at night with a torch you will find the culprit is vine weevils

 

Aha! thank you! I will do some detective work tonight
nicola

 

Please let us know how you get on Nicola! Any pics are most welcome albeit I am still struggling with the pic thing.

Kind regards
Roy