Don't think that this has been mentioned on here.
The EU are set to approve the Covid Vaccine Passport later today, which will replace the need for tests.
Download the NHS app and then it takes a couple of days to get your details confirmed and linked to your local Medical centre. If you've had two jabs, like me, you just need to show your Vaccine status from your NHS app which works in real time giving a QR code in place of all the tests.
I don't know if this will be in place by next week, but it may be. Would save me the price of the tests, although still got to get them for my two boys, but worth looking into..