Isn't it a number of factors really (and not all Tory voters voted brexit at all plenty of Labour voters in the red wall did as the election showed). Lack of transport is one of the main reasons I hear, which, has with everything, has many different factors attached. Pingdemic of course, the very low wages for lorry drivers which is not attracting new people in and certainly no one young, with the older drivers earning more as supermarket drivers (In some cases) so leaving. Many of the overseas drivers had gone home for the pandemic (even those that applied for residency)so lets see if they return or decide to stay.
Now I have no doubt Brexit will be a long term issue and a shit show for some time. Think the government will have to look again at their immigration rules as we see areas suffering and this pandemic has masked the issue for them. They should of course be thinking about what they should do and doubt they have but with a bit more time between brexit and the change they will make people will not notice, or care as they want the shelves full again.
Be lovely to see someone say we don't need all this stuff really as we waste so much, get used to having less (you fucking voted for it)