I'm a lot higher up the hill than the RC Private Buttons and the gradient on our street at the top is 14% it's a real killer coming up !
https://www.google.co.uk/maps/@51.39...7i13312!8i6656
That's my house with the window open at the very top and if you swing round on the top road you can see why I'm always on about cutting sack fulls of my hedge in the summer !!!