I can think of only three reasons why the advice on shielding should ever change:
1. Someone no longer needs to shield (e.g. because their course of chemotherapy has come to an end ) ;
2. The incidence of Covid-19 in the general population becomes so low that the chances of contracting it become negligible ; or
3. A vaccine has become available.
Unless my first reason above might apply to you at some time in the future, you'll probably have to wait until one of the other two reasons comes into play. In practice that could mean waiting until a vaccine becomes widely available, which (based on some of the current estimates) might be around Easter of next year.
So, if you're determined to wait until there's some official advice that scraps shielding, Barsel, I suspect that you're going to have a VERY long wait.
In the meantime all you can do is to think about a bit of 'risk management' and decide what it is that you're prepared to do (even if it goes against the official guidance).
I'm officially 'shielding' but, through exercising extreme caution about how I go about things, I'm still doing my own shopping and I've even visited the seaside twice (just to stop me from cracking up).
You might just have to accept a bit of (low-level) risk-taking in your life!