If it,s a deciduous shrub, or a herbaceous perennial, then yes they will lose they,re leaves, some species are not reliably hardy and need some winter protection depending on where you are in the uk.

It is deciduous, and so many trees and shrubs are losing their leaf early this year.

This is a decidous shrub, Petras, so it is to be expected that it will start to lose all its leaves now. Unless you are in an area of the UK with really severe winter weather it should be hardy.

Thanks for the replies, much appreciated. Glad to hear it's supposed to happen!