I tried to, but unfortunately, my veins are knackered and they couldn't get a line in.
I was given 8 pints in transfusion after a bad smash in , and after 2 months of drips, arterial lines and injections, the veins in my arms couldn't take it. They would tissue after 20mins of the line being swapped. Even now, nearly 20 years on, it's hard work for nurses to get the vein just for a simple blood test.
I'd like to be able to return the favour and give blood back, but I can't. Although my parents on the other hand, they still regularly give blood as their way to say thank you for the wonderful work the service does on our behalf.