I had mine on Friday too. Very, very impressed by the organisation, atmosphere and the huge number of happy volunteers of all ages.
If you have the Pfizer jab, you're asked to wait around for 15 minutes to make sure you don't keel over (very unlikely, but that's part of the protocol). In our case, this meant sitting in a very well ventilated room (all doors and windows open) on a cold and breezy evening. Those who'd nipped in in T shirts to make it easier to get jabbed were looking very blue by the time they were released. Those who'd taken jackets looked very smug.
Like Crickleymal, side-effects very minor - a bit of shivering and achiness. Hardly even man 'flu...