I grew Sensi Durban a couple of years ago outdoors.. you will probably need to force-flower it early to get a decent crop..
They were healthy, vigourous plants and had no problem with mold considering how wet it was. Yield wasn't that great but ok.
Tbh though I will probably not grow it again - I found the high (though not that strong) a little too paranoia inducing for my tastes and left me with quite a fuzzy/thick head the next day... but saying that it is quite a good daytime smoke when you need to get things done like clean the kitchen or something

Made very nice tasting hash though...
Early Girl is supposed to be better... I have some of those seeds but haven't bothered as yet...
I would strongly suggest something like
Biddy Early from Magus for an outdoor UK grow as it is Sativa dominant (I think) and a lot stronger, oh & a bigger yielder... I also heard good things about
Rox from Paradise Seeds... again for UK outdoor.
just my 2p
Good Luck in your decision!