A snapshot of a difference of 12 months in the UK. It is worth reading the whole article as it explains what's going on.
2 big differences. As for travel? It's gone nuts. People just couldn't wait to get out and on holidays. When the rules changed that double vacc'd didn't have to iso on return, the flights filled up. The infrastructure can't cope as many staff are still on furlough (a govt scheme to keep some income coming in) or they are not used to the demand. The next test will be when the kids return to school next week.
1. Immunisation.
2. Widespread testing.
https://www.bbc.co.uk/news/health-58281664
Current infection and death rate in the UK.
https://coronavirus.data.gov.uk/