Unfortunately, fetish says that doctors in the UK are not very cooperative. I'm also about sure that you could obtain help from most any physician or even Urgent Care Clinic here. Perhaps, if you have a family doctor, you could explain that you wish to give a vial of your blood to someone very close to you and he/she would be willing to assist. Most would be if for no other reason than to prevent the possiblity of infection or blood borne pathogens if they think you are serious and are going to do it with or without their help. Good luck on your quest!

tyd