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Just for confirmation rather than a random on the internet: From the gov site - https://www.gov.uk/guidance/coronavirus-covid-19-testing-for-people-travelling-to-england
If you are returning to the UK within 3 days, you can use the result of a COVID-19 test that you take in the UK before you travel. You must use a private test provider for the test and not an NHS test.
The service on which you will arrive back in the UK must set off for the UK within 3 days of when you took the test.
Having just filled in the EUPLF I think you'll need to put in an address, but if not staying overnight then where you are visiting I imagine.
I'm over for a couple of days this week.
For your short visit you need official PCR or Antigen test (from the official supplier list) within 48 hours of leaving (I've used Randox) and then a 2 day test on return. The pre-flight test will cover you so you don't need a test over there for only 28hrs. Fill in passenger locator forms and have FFP2/3 mask for flights.