Dear Sir or madam, I work for Cancer Research UK and have been given your details by ?????? at the Department of Health. I was wondering if you might be able to help me. I'm trying to find out the estimated number of people who redeem NHS wig exemption certificates. Is this something that you might know or would you be able to pass on my request or give me the contact details for someone else who might know? I'd be really grateful for any help you could give me. If you could email me or call me on the number below, I'd be extremely grateful.