Anybody can enter their LFT results on the Government website. They will email you or text you to tell you what the results are so you have a record.
It seems to me that the majority of people who are getting Covid, and there are plenty I know, are getting little more than a bad cold or mild flu. It is only those who are vulnerable or immuno-suppressed who might find it harder to cope with. For that reason alone, I would never go out without testing. However, 3 members of my family had symptoms and tested immediately. For 2 days they tested negative and on the third day, they tested positive. To confuse matters further, the first day they had symptoms, they felt really rough and then the second day they felt better so went out again before feeling unwell enough to test again on the third day. As they had been with me on the second day, they were mortified to think they might have passed it on to me but a couple of weeks later with regular testing, I appear to have escaped.
I think we just have to accept that this is now like ordinary flu or colds. Some people will be hit harder than others and it will kill some people just like flu does every year.