The UK restrictions are not this. You can leave the house whenever you like if you have “reasonable excuse”. There are no explicit restrictions on how often, how long for, and how far and where you can go.
The UK government has been saying one thing, and enacting another in law, which leads to this one of confusion, but what you’ve stated there has never even been said as far as I know.
In the UK. Went out several times in the last week for a long walk. It's allowed for exercise.
Streets were fairly busy with people.
The local town square was packed, every bench spot was taken. Seems people have decided lockdown 3 is for hanging out at the local square. Pancakes were on sale.
At the same time, hospital ICUs are fuller than they have ever been, some hospitals are having to reduce oxygen supply per patient due to overload, and the death rate is higher than it's ever been.
And people are outside those hospitals protesting without masks that the pandemic is a hoax and hospitals are "empty". What a thing for doctors and nurses coming off shift to walk into.