if there is still healthy growth else where on the shrubs then they will recover. Cut off the damaged bits so they look more appealing and then let them get on with it.

Frost might have caused that sort of damage for sure, but East Anglia is renowned for being dry - I've had the sprinkler on in various relatively newly planted areas twice, first time a month ago, then 2 weeks ago, here in the south east, (and it really needs doing again now, hoping we'll have enough rain not to bother) so if you haven't watered, that might be contributing, especially for the new plants.

My hydrangea has been badly damaged by the frost and I feel sure I have lost all flowers for this year.
However there is good growth about 6 inches down so will trim back to that.
I live in North Hertfordshire.

Thanks to all your responses....I had watered..(emptied 3 water butts)...now the rain has come. I'm going to sit tight & wait I think.