little al
Crystal Palace fan
It takes a lot longer (about 90 minutes all in) and you have to be hooked up to a centrifuge that spins your blood and extracts the platelets from the red cells, which are then fed back via the needle.
They don't have as many platelet machines comared to extraction of whole blood as it is a much more expensive process, but you do get lots of biscuits!
You would need to check up with your local blood donor centre first to see where the nearest platelet/plasma centre is, I'm fortunate that mine is close to work.
I will look into this. Are you hooked up in the same way as normal donating?