If you mean Prunus laurocerasus, then I assume you'd normally cut it in May, so I'd advise you wait till then and just give it its normal cut - this should remove most of the dead areas if the damage has really been caused by the winter. If the hedge is an informal one, you can cut out the dead areas before then, but where you live, I wouldn't do that much before end of March or April. Otherwise, check the stems and the base of the plant/s which are showing damage for signs of rot or disease.

Many thanks for that i will do as you suggest

Graham