Thing, I just checked the BGA website. Two things.
If you have at least bronze plus an x-country endorsement the BGA office apparently will issue you an ICAO compliant license right now. Or at least some paperwork saying you meet the ICAO requirements, or something like that. This is needed in case you go gliding in a country that does require a license.
Further, there is an FAQ on future licensing that is fairly vague at this time, but promises that everything will be sorted in the near future, including the process to obtain the license.
EASA Licensing