I heard that a lot of polish have returned because things have got a lot better back home re jobs and medical treatment. Not because of Brexit to which they just needed to apply for status didn't they?
Anyway there seems to be loads of wanna be truckers waiting for paper work and tests. DVLA dragging their feet big time. This is a problem short term but long term Im sure it will be fine.
Brexit was always going to take years to sort out but chuck a bit of worldwide pandemic in the mix and.....