The Sussex hop was first grown by Peter Cyster, a retired hop farmer, propagated from a wild hop he liked the look of. Oil analysis has shown it's a new variety, and if I remember rightly it was suspected it was a daugher of Boadicea as it's a also a dwarf variety, and Boadicea is grown on the hop farm where it was found.
I visited the farm back in 2011, when Sussex was grown in one corner. I was surprised to see that the winning hops were grown by A H Hoad and Son, but they've now been growing Sussex for two years so production of the variety is spreading. I have a slight edge on them as Peter Cyster was kind enough to give us some plants at the brewery and I've been growning a Sussex since 2012. I don't think mine will be winning any prizes though, but it goes well in my annual green hop beer.