Rhinoceros Party? Their slogan: "Putting the party back in political party".
Last time we had the Party Party, but I haven't seen any sign of them this time. Many years ago the local football hooligans put up a candidate in Portsmouth. One of his policies was "Duty Free goods on the Gosport ferry". The ferries that ply between UK and France from Portsmouth used to have duty free goods, and he wanted the local 5 minute foot and bicycle ferry to have them too.

Natural Law is still around in UK too.

Re Nationalist parties in UK. Well of course the Scots and Welsh have been given their assemblies recently. The Scottish assembly has more power (though Billy Connolly still calls it "a wee pretendy government") than the Welsh, and has already passed laws at odds with the rest of UK. For example, reverting to free tuition at Universities, and paying for residential care for the elderly, which has led to the gibe that Scotland is a place to be young and to die, but you wouldn't want to live there. Which brings us to the "West Lothian Question": how come Scots MPs are allowed to vote at Westminster on English matters, while English MPs can't influence Scots affairs? http://www.edinburghac.demon.co.uk/placid/lothian.htm covers this quite well.

Rod