Not sure of your location but it has been so dry this month here in London, I would say plenty of water and see if they pick up.

I'd concur with Grandmage, but knowing where you are in the UK would have made answering this a bit easier. If you're anywhere in the south, it's been far too dry, and bare root plants should really have gone in in February/early March at the latest. You will need to soak them regularly to give them a chance of survival until they start forming water seeking roots.

I sent pictures of my bare root laurel hedging to the supplier - who agreed that they were below the standard they expect of their plants. They did offer to replace them FREE OF CHARGE although I did pay a bit extra and 'upgraded' to pot grown plants. Had no problem with the new plants. Hope your supplier looks after you....

Thank you for ur comments, I live in Derbyshire, we haven't had much rain but I have been watering them, maybe not enough though, I will give them a good soak regularly and see what happen, can you over water them?

No - not unless there's solid concrete or something underneath the soil where you planted.