Q.Honeysuckle
I have just got back from holiday to find my honeysuckle bush has been devastating eaten by something. It looks like snails but never seen anything like it before – any suggestions, do I just chop it back and let it grow again next year – all the leaves have been munched.

Inspect the shrub for any signs of pest.
Neem Oil can be used and will treat most sucking pests.
It's possible a critter such as rabbits or deer also could be the problem.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm