Thanks for all yours replies.
I'm a total neofite, but it doesn't look like Parthenocissus vitacea to me, the leaves does not have pronounced jagged edges, just very light ones.
Likewise, it might be Parthenocissus quinquefolia, although the pictures in the database are so different from one another it's hard to tell in my inexpert eye.
The plant I have got the cuttings from grows in a garden, so it might not be native.