My Dollis Valley hike starts at West Finchley Tube, however when I walked it, the Tube was not working and I got a bus. Online you will find references to the Dollis Valley Greenland walk - this is part of my trail but starts over near the M1. All my route is recorded by GPS and saved on Strava HERE. Like most of my hikes this is about 10 miles long.
From the station find your way to Dollis Brook - which runs alongside the Golf Course at the end of Fursby Ave. At the end of the golf course you need to tackle the B1462 for a very short distance - however here is an interesting point on the walk - Dollis Hill Viaduct. Worthy noted as the highest point of the Tube network standing at 18 meters tall.
The walk takes you under the A1 and then under the north circular as well - both extremely busy roads and although noisy at these points it is still very rural underneath on the walk. Just before the North Circular the brook divides and goes on to form the Brent. We turn left at this point and follow the stream which is now called Mutton Brook.
HERE. In a nutshell it was the invention of a husband and wife team back in 1906 although built for all classes it is really only enjoyed by the wealthy these days. A point of interest here and just of the trail is St Jude's on the hill. From here you are walking over to Hampstead Heath and all the way down it whichever way you think best.