Just came across this whilst searching for something else, but
Matchless London went dark after their Managing Director
Michele Malenotti died in a scooter/moped accident in Italy on 23rd March:
Michele Malenotti, owner of Matchless London with his family and a former owner of Belstaff, has died in a motor scooter accident, aged 42.
wwd.com
Their last post on some of their various social media platforms was 3rd of May, but that seems to have been a pre-queued post that made no mention of his death, so it seems that they really have completely shuttered their business for the foreseeable future.