From 04:00 GMT on Friday 7th 0f Jan 2022, fully vaccinated travellers coming to England will no longer have to take a test before they travel.
That means no worry about paying for your flight and booking into Somewhere Different and then not being able to to show up.
When you arrive, you do not have to quarantine in Somewhere Different. You can go out on the beach, super market etc.
You do have to take a lateral flow test and as long as you are negative, that’s it. You are done and can focus on your work and exploring.