When we spoke to 111 last week because DH was very poorly, they said they're not testing anyone unless they have a relevant travel history or contact with a known positive case.
As far as I know, there are cases that are positive in the community, where there isn't any travel history or contact with a known case.
So it is already in the community, but we were told DH wouldn't be tested, and not to go to the GP/A&E unless he had breathing problems. So he would never be diagnosed with CV unless he got sick enough to need hospital.
How many others like him are there, with symptoms, no known contact, but no testing?
Of course, it could be anything ... but for PHE to assume that it's not circulating in certain communities is misleading, when the testing isn't being carried out to back this up. (Or may be there is testing in only some locations? I don't know if 111 advice is specific to certain areas...)