Even on the BBC's charts you have 10 countries that don't have any national lockdown whatsoever ! And another 7-8 that were either later than the UK or at the same time (inc. NL and Germany) - are you sure you are not looking at it upside down ? Anything before a total lockdown was a waste of time because no-one took any notice, anywhere.
Germany had national recommendations three or four days before, and localised lockdown the day before.
Netherlands had local recommendations about two weeks before and national recommendations about four days before. The UKs biggest problem has been unclear, inconsistent and late messaging, which is still continuing.
And people did take notice before total lockdowns, if the message was clear. In Ireland, most companies shut down a week before the lockdown for example.