This tweet sums up his conclusion pithily, but the whole thread (by someone whose business is built on importing wines) is well worth a read.

It goes into meticulous detail, analysing all the new (to us) red tape involved because of Brexit. Indisputable evidence of the disaster. https://t.co/WUUwYC6wG8

— Edwin Hayward (@edwinhayward) January 16, 2021