Thanks for your help Wavelea1 and Matzukaze
We cant wait to go its been ages since we visited Cornwall
Will definately visit Breney Common I have never seen Marsh fritillaries before and they should be around when I go
I'm also into dragonflies so hopefully will see some of them too
Penhale Sands sounds good we've got a good place near us (Prees Heath) but it will be worth visiting Penhale to see if the silver studded blues there are different to ours
Pete