Initially I identified this as Green Hellebore but thanks to PH's wife my ID was corrected. I did guess it might be a cultivated form.
All these flowering plants were in the Marine Park, South Shields.
A warm (12oC) brought out lots of insects and the birds were in full song. Unfortunately they might be in for a shock if the weather turns colder.
Silk Tassel Bush?
As you can see I'm not too good with garden plants. I must get myself a 'field' guide.