Litespeed have released a new version yesterday, which updates the QUIC spec to 43 that the latest Chrome builds support again. So any sites running via HTTPS from cp1.mattwservices.uk will now work via QUIC on Chrome.
The update also bring in support for TLS1.3
I've tested one of the...
For anyone using HTTPS on the shared hosting platform, QUIC is now enabled and available.
QUIC - Wikipedia
LiteSpeed Announces QUIC Support
You don't need to do anything, as it's enabled by default for anyone with HTTPS running.