I think the "same test used" is just referring to

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Our recommended PCR Antigen Covid-19 testing suppliers
Screen4 (Self-test kits and clinician test locations)
Screen4 offer both self-test kits sent by post, or a number of locations for clinician testing. Please check the Screen4 website for the latest available locations.
The test will tell you if you are positive or negative for Coronavirus (Covid-19). The PCR test can be performed at home by yourself or Screen4 can arrange for a clinician to carry this out for you (location dependent).
The test requires taking a swab from the throat and nose, this sample will then be sent to laboratory for analysis using the polymerase chain reaction (PCR).

It takes 24-48 hours to return the result once the laboratory receives the sample back. This result will be used to form the certification that you require to travel and will be sent to you via email. Please note result reporting times can be up to midnight the next working day.

Reporting times may differ over weekends and bank holidays.

Screen4 will provide you with a 24 hour tracked returns envelope to ensure your sample gets to the lab on time.

Visit the Screen4 website

binx health (Self-test kits)
Binx health provides a quick and easy Covid-19 PCR antigen testing service.
Their test uses a self-collected throat/nasal swab, which is delivered directly to your home and once returned via contact-less courier service, is followed by a PCR test carried out in the laboratory.

Once the laboratory has completed your test you will receive your Safe to Travel test certificate and you can get ready to travel! Their service is fully inclusive making it easy to order, collect and send back your sample without even leaving home.

Visit the binx health website

Collinson (onsite testing at London Heathrow, for Hong Kong travel only)
We’re pleased to be working closely with Collinson to provide customers pre-travel testing onsite at London Heathrow Terminal 2. Currently this type of test is only available for customers travelling to Hong Kong. If you’ve not already made plans for your testing, you can use this service before check in.

The test available is a ‘Covid-19 RT-Lamp’. This test type is accepted by the Hong Kong government. With a negative result, you’ll be able to board the plane and travel to Hong Kong.

Upon arrival at the testing centre, you’ll be taken to a booth where a registered nurse will perform a nose and throat swab. It will take no more than 3 minutes.

Click ‘Not a member’ to set up an account. You can book a test from 4 hours before your scheduled time of departure. The latest you can carry out your test is 2 hours 45 minutes before your scheduled time of departure.

If you haven’t managed to pre-book, you can still book a last-minute appointment providing you arrive at the airport at least 3 hours before your scheduled time of departure.

Your test results will be available in a sealed envelope at the testing centre approximately 80 minutes after having taken your test. You’ll receive an email to let you know when you can pick the results up.

Book online in advance before you arrive at the airport here

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