When in doubt, ask a local
When using public transportation, I always aim for really early rather than really late. Getting the booster appointment had been easy enough, but I didn't want to have to reschedule either. Following the suggestion from the woman at NHS, I looked up the 6a bus route and found that it ran every 12 minutes. If I miss one, I could catch another with plenty of time. So I set out an hour before my appointment time and found the bus stop easily. It was even a fancy city route with a board for arrivals, which said I had 3 minutes to spare. I bought a round trip ticket on my bus app and watched for it down the road. I watched it approach, I stepped out, and then watched as it passed me. I waved at the driver, and he waved back. Crap.