Have you considered setting up an MHF page on JustGiving? I would say most of my charity donations go through JustGiving nowadays. It has made it so easy, and charities receive 120% of the donation as JustGiving sort out the Gift Aid side of things for you. Emails, receipts, credit cards, Paypal are all handled slickly.
Here is the starter page for creating an MHF custom page giving direct to Mesothelioma: