@Cornettoninja
From where I’m sitting it’s almost certainly to do with supply/demand. (Which, as an aside, is largely a consequence of the governments change in policy to test for several days as a contact as well as testing twice for early release from isolation. Looks like they failed to take into consideration the high demand given infection rates imho).
Symptomatic people, I presume, will still be required to do a PCR.
Worldwide demand for PCRs and LTFs means the cost of regents (and tests) has gone through the roof.
What is the point in the NHS paying for two tests to prove the same thing if reliability for a positive ltf is high enough?
We no longer need to know case numbers - its hospitalisations and deaths that matter. PCRs are likely to be used on hospital admissions (so that covers sequencing issues and new variant detection).
The issue with the change is over isolation really at this point. Firstly because of the issues of legalities of breaking isolation (however its not really being enforced in a meaningful way anyway) and employment. PCRs at least force people to test through social pressure (and you can then prove you haven't got covid). LTFs not so much.
Therefore my suspicion will be that you have to register your ltf result to be entitled to your rights under employment law. If you don't understand this / this isn't required by government, that is where people will fall most through the cracks in various ways.
In theory its a good idea. Most people I know who test positive do so after having a ltf first. So those being responsible have already proved themselves 'trustworthy' as such. We have a good culture of testing in the UK now, so perhaps we've almost 'earned' it.
In practice it worries me that it leaves some people vulnerable to being sacked. And there is the issue of isolating before a pcr result - it will discourage people from doing so. And it will massively confuse people about what they are suppose to do.