I think the issue is that when lockdown was implemented, people were terrified, watching Italy and being told that what was happening there WAS going to come here. So people on the most part complied with what they were told to do. There was also the whole "you must NOT come to hospital even if you are ill" thing. People were told by 111 to stay at home even when they were quite unwell, because the insinuation was that otherwise the NHS would fall apart, which also terrified people. Because of this for the first few week people on the most part complied with what they were told to do. As time has gone on, people have talked to people in their local area and become quizzical, saying "No, I haven't heard of anyone local with the virus either. I mean, such and such have had X, Y and Z symptoms, so MAY have had it, I suppose....." So to a lot of people, it hasn't quite been the Black Death scenario that was put to them initially. And they have relaxed a bit because of this. If everyone with symptoms, not just those in hospital, had been tested from the start, then in my opinion then people may have taken it more seriously. There are plenty of people who've been saying "well, such and such was quite ill actually, with chest issues and temp, but it's probably just a normal virus".
I'm in Liverpool and we're one of the worst affected areas. I work in a school and know a number of pupils who have lost family members to confirmed covid cases. Family work in the NHS and have been having daily interactions with severely ill covid patients. Other people I know have personally seen ambulances arriving in their road to take neighbours with suspected covid to hosptial.
If you haven't experienced any of this, then I have no doubt that that is causing people to relax a bit. This is coinciding with government saying we have passed the peak and talking about exit strategies happening soon. It is inevitable that people are now going to relax their vigilance.
Even though people have been really good round here, and I think it's becuase there HAVE been lots of cases in my region, just yesterday I saw a local chippy open, with quite a few people waiting inside, 2 members of staff standing side by side behind the counter, and a woman running from her car straihgt inside without reading the notice on the window about only allowing 3 customers in. There were already more than 3 customers waiting, and no sign of anyone telling her to wait outside.
I had to do a morning on Reception in work, as part of a number of staff on a rota. There was no spray, wipes, gloves, nothing in place and it was a PC and phone etc that different people are using each day.
We are not really ready for lockdown to relax, but people think we are, and this is the real danger.