I can't actually say as it was an old cut from Birmingham( I got it around 2010)from my mate in London who had mate up there he did business with , and this crew in Birmingham been running it for years as there exclusive strain.
My mate swapped the Cheese clone we were running and they dropped the Silver Nevil .
My mate never had any more info and from them.
I think Silver Haze myself as I've run the SSH many times , many packets and this pheno is not like any SSH phenos I've run or smoked over the years. It's has similar terps to some Mango Haze phenos, Mango N Church Terps, and heavy Frankincense fills the room whenever smoking it, amazing clear High.