Donald Campbell

These belong to somebody I know, he was at lake Dumbleyoung in 1964 when Donald Campbell was attempting a land speed record, he got to meet Donald Campbell his wife and crew members, he asked for their autograph which they were happy to oblige with but the only piece of paer he could find was his pay packet, I thought getting all of these autographs on one piece of paper is very rare, what he wants to know is it worth anything as his wife is very sick and requires ongoing medical attention?