awesome, thankyou very much Tish, and Merry Christmas!

my Mum said they might be banana passionfruit but wasn't 100%, and my
memories of banana passionfruit were that they were more longer than these
roundish ones im getting so I wasn't sure either

Everything suddenly makes sense now lol ...

Three years ago i planted 2 x Nelly Kelly vines, but only one of them took
off (and currently has approx 20 unripe passionfruit on it at present) .....
I thought the other one was dead, but it turns out only the Nelly Kelly
graft of it is dead ... the rootstock has shot off a vine of its own which
has basically gone down the entire side of my fence now -- very vigorous,
like you said. It may even start causing problems for the Nelly Kelly vine
so I'll have to keep my eye on it to make sure they play well together

So now i've not only got a Nelly Kelly passionfruit vine, but also banana
passionfruit too lol ..... Christmas bonus! :-)