In what ways has the issue gotten worse?
A shortage of HGV drivers is also caused by Brexit.
European countries are in need of more HGV drivers, but Brexit has made things worse in the UK. Drivers who returned to their home countries or choose to work in other countries are now restricted or unable to return.
Back in the days when the UK was a member of the EU single market, drivers had freedom of movement. This is no longer the case as a result of new immigration rules.
IR35 and Tax
Additionally, drivers from across Europe are finding it more difficult to work in the United Kingdom due to a change in tax law. (IR35)