I've realised I mistated the situation as regarding voting rights for EU citizens resident in the UK. Citizens of two other EU countries have full voting rights - Malta and Cyprus.
So a Greek from Cyprus gets the vote, whereas a Greek from Greece doesn't.

It's really a bit of a dog's dinner of an electorate really. Someone who'd spent years fighting the British in Ireland or elsewhere gets the vote, a Ghurka from Nepal who'd been in the British army, doesn't, but Sikh from India who's done the same does.

But the Cypriot who can vote is still liable to be deported along with the Greek if the government's bid to use EU immigrants as bargaining counters comes unstuck...