You can contact them by using this online form:
http://www.nationalarchives.gov.uk/contact/contactform.asp?id=1Cost of their research service is approx £20 per 15 minutes. I have yet to see them copy a CRS 10 in 15 minutes. You can of course use other independent researchers.
Contact me by private message if you wish me to provide you with a cheaper and more reliable alternative option.
Regards
Hugh
