Don't know about a practioners in North Yorkshire, but I do know you can buy the Bach's Rescue Remedy from any chemist or health food shop. It's brilliant for calming people, dogs, horses and even cattle!!!!
Someone called Nicola Bebb is a Bach Flower Remedy Practitioner, who has quite a good reputation. Not sure where she is based, but she makes up specific remedies, not just Rescue Remedy. If you google her hopefully you will find her.