(Sorry about blurry photo - was windy out there today!)
I'd go for Cabbage White butterfly - but it's so blurry that I have to be a little uncertain.
There seems to be a few of them doesn't there...
If any have their bums in the air I'd check out sawfly larvae...
I think Vic is right, saw fly larvae. Judging by the numbers and what they eating
I agree - sawfly larvae - they're having a go at my Rosa Bonica too
Hi, yes, I was looking at wildlifeinsight.com earlier and come to the same conclusion.
not sure whether to bin them or hope the birds get them. I'm in a good wildlife area so apathy seems to work for pests. But don't want them overwintering.
i also found a dagger grey moth caterpillar today. Fascinating!
Ps. Thanks everyone!