It is not generally known that citizens of the Commonwealth and EU can serve on juries in Britain

It is surprising that being called for jury service is not limited in Britain to British citizens. Foreigners can both vote and sit on juries. This situation is not likely to change for at least a few years.
https://www.legislation.gov.uk/ukpga/1974/23/section/1
https://commonslibrary.parliament.uk/research-briefings/cbp-8985/

generallyknowncitizens