Please for the love of cheese would someone help me with picking a COVID test - arriving Heathrow

[CheddarGorgeous]

• I'm arriving at Heathrow on Tuesday morning.
• I'm fully vaccinated.
• I'm arriving from the US.
• I won't have a car.
• I need immediate results because I am supposed to be attending a work event that evening.

So I want:

1. A test centre in Heathrow Airport (not one that says it's in Heathrow but is a mile down the bloody road) OR one posted to my hotel.
2. Results within hours.
3. Able to generate a booking number for my passenger locator form.
4. Preferably not £££££

Please Mumsnet can you help me? I've gone round in circles for hours.

Where are you travelling to from Heathrow? We've used the testing facility at Paddington before having got the Heathrow Express although I don't know how quickly you can get results.

Thank you @mynameiscalypso I'm going to Abingdon. So my options are train via Paddington or bus. I never thought of Paddington, shows how befuddled I am!