So what role does it play in Brexit?
Wikipedia on Jersey:
"Jersey is not part of the United Kingdom,[16] and has an international identity separate from that of the UK,[17] but the UK is constitutionally responsible for the defence of Jersey.[18] The definition of United Kingdom in the British Nationality Act 1981 is interpreted as including the UK and the Islands together.[19] The European Commission have confirmed in a written reply to the European Parliament in 2003[20] that Jersey is within the Union as a European Territory for whose external relationships the UK is responsible. Jersey is not fully part of the European Union but has a special relationship with it, notably being treated as within the European Community for the purposes of free trade in goods."
Jersey is a separate entity, and governed by itself. And was left to it's own devices when invaded by The Germans. As was Alderney, Guernsey and Sark. Known as The Chanel Islands. More French than English. Many people were slaughtered, including foreign prisoners of war. Britain did nothing to help them. The Tunnels dug by the prisoners are still a disgrace to humanity.
God alone knows what The British Police were doing there at Haut de la Garenne. Even Martin Grime said that his dogs didn't need to be registered according to British Law, which his dogs weren't at the time.
Martin Grime copped 96,000 Pounds for that debacle. Tis no wonder that he could afford to go to America.