I e-mailed them a few months ago giving them the details I had regarding a marriage in Newbury. I gave names of bride and groom, date and place of marriage, explained that I was unable to visit in person and asked for any other details on the marriage entry and they did a free look up for me. So send them an e-mail and ask, it can't do any harm and they may be able to help. I think they only charge when they have to search through the Registers, because that takes time. With names, date and place they can go straight to it.
Emeltom