Well it's official I'm a complete dick! Ordered a DIP rail for my cz452 varmint .22lr from America, only went and ordered the wrong bloody size!!
I've just ordered the correct mount but now have a spare DIP Picatinny rail to suit a 3/8" dovetail for a cz452 (0 MOA) up for grabs.
As new never been fitted £39 or swap for 26mm low rings to suit a picatinny rail