Yup, I got a letter a few weeks after they took the sample.
Was a very humbling process, although anonymous you can figure out various things about the receiver.
I opted for the ‘filter your blood’ option, rather than the massive needles in your pelvis under GA.
It was a week or so of prep, where you get injected with a dose of medication to boost your blood with whatever they want to salvage, basically makes you have growing pains. A lot.
Then you’re hooked up to a machine for a day or two while they pump you full of fluids and filter your blood out.
Worst bit about the whole thing was having 4L of saline pumped into me, and not being able to go to the loo for a piss. They offered a bottle, but I opted for holding out.
They pay your expenses, mileage, decent hotel & meals so it’s pretty good