LorisBatacchi
Some operators with a UK base are requiring British passport holders to apply to convert their UK EASA licences to an EU EASA licence and will have them apply for a UK validation in January 2021 (and shortly thereafter, a UK licence which will sit alongside the EASA licence. ) This will allow British passport holders to fly both G- registered and EASA-registered aircraft based in the UK. I can think of one operator with a UK base that is doing exactly this.
The legal right to live and work in the UK or EU (as appropriate) remains a valid concern - the UK currently seems to be more flexible with regards to this question than the EU. We will see !