I've mentioned giving blood to SB since I met him, he's never done it because his previous job involved too much travelling. My ex was particularly resilient with no actual reason behind it, so I haven't harped on too much about it, but he's obviously given it some thought as I just got an email from him saying that he has been trying to get an appointment when they have a session in his town next week but there are no appointments available during the three hour window that he has.
So I emailed back the following: