Have a careful look around for dull very dark brown/almost black beatles which seem to have nobbles on their backs. They are Vine Weevils, and beastly little creatures they are too. They munch on leaves, but worse still are the bugs, which develop in soil and eat the roots of plants, thus destroying them completely.
Earwigs also eat flowers so look out for them too, but my first bet would be the Vine Weevils. Here's a link which might help you:
http://www.rhs.org.uk/advice/profiles0600/vine weevil.asp