Make your way to the cul-de-sac at the end of Leighton place...

Follow the lane (which is actually a continuance of Leighton place) until you reach 51, Leighton Park. It's right in front of you.

Take the driveway to the lower level on your left beyond the speed bump. You'll proceed through some large black gates.

As you come around the curve to the lower level we're right there on your left.