@Leylo sad to here that. The issue seems to be that at the start of this process it really wasn't at all like it is now. It was all done over the phone/invitation, whereas now people book in - by and large - themselves online and also book their second jab at the same time.
But, I appreciate the anger, it's not good to make sweeping statements like 'they aren't sticking to 12 weeks'.
My dad's gap is 10 weeks, my mum's gap is 9 (as they've already got their second ones booked in).
The logistics are incredible for this. The issue will be ensuring people who had their jabs at the start when it was more about getting old/vulnerable people (who also may rely on others to get them there, and those others may also have been jabbed too) get theirs. It won't be an 'issue' on a wider scale, but there will be glitches. They'll get it sorted though. It's what they do.