Boundary Ride #3. Enfield Lock to Mill Hill Broadway

Waterways, rewilded estates and a secret wartime listening post.

A 27 km ride across the upper edge of North London that starts and finishes at Zone 6 stations, stays largely off-road throughout, and manages to feel genuinely rural for most of its length. Both Enfield Lock and Mill Hill Broadway are on the TfL network, making this one of the most accessible rides in the Boundary Rides series. Hop on a train, ride back, no car required.

The route follows the New River north from Enfield Lock, climbs through Forty Hall Estate, crosses the rewilding landscape of Enfield Chase and rolls through the long open paths of Trent Park before dropping to Chipping Barnet and finishing at Mill Hill Broadway. It is a ride defined by flow rather than drama. Water to woodland, estate to high ground, the city edge present but never intrusive.

Ride Details

Ride Level: Easy (Green)
Distance: 27 km / 17 miles
Terrain: Gravel, singletrack, bridleways and quiet roads
Bike: Gravel, cyclocross or MTB
Includes: GPX route file and downloadable ride guide

The Route

The ride begins on the towpath at Enfield Lock and joins the New River almost immediately. Built in the early 17th century to carry clean drinking water into London, the New River is one of the city's great hidden infrastructures. It no longer supplies water but the channel survives, threading quietly through meadows, allotments and suburban back gardens for several kilometres. It is a peaceful and slightly peculiar start to a ride.

From the water the route climbs to Forty Hall Estate, a Jacobean manor set within rolling farmland on the edge of the Lea Valley. Once home to a Lord Mayor of London, its surrounding fields are now managed with rewilding in mind. Gravel tracks replace towpath, the horizon widens and the city starts to feel a long way back.

Enfield Chase follows. A former royal hunting ground now the subject of one of London's most ambitious reforestation projects, young trees, restored watercourses and new hedgerows are gradually reshaping the land. Riding through it feels like passing through a landscape mid-sentence, something in the process of becoming. Then Trent Park arrives with long, flowing paths through mature woodland, and Chipping Barnet provides a natural pause before the final stretch to Mill Hill Broadway.

Trent Park and the Spies in the Garden

Trent Park looks exactly like what it is today, a grand open estate with wide lawns, mature trees and peaceful paths. What it was during the Second World War is considerably more interesting.

Between 1939 and 1945, Trent Park was used as a secret interrogation centre for captured German generals and senior officers. The house was wired throughout with hidden microphones. Conversations in the bedrooms, the library and the gardens were recorded and transcribed by intelligence staff working unseen in the basement. The officers believed they were simply being housed in comfortable surroundings. They were not.

The intelligence gathered here is now considered among the most significant of the entire war. The generals talked freely, discussing operational plans, troop dispositions and weapons programmes, none of them aware they were being listened to. A small museum in the house covers the full story and is worth the detour.

Finish

Chipping Barnet was a medieval market town on the Great North Road, an elevated staging post where travellers paused before the long ride north. Its position still gives it wide views and a slightly removed quality, as though it never quite became London despite being swallowed by it. A good place for a coffee before the final kilometres to Mill Hill Broadway.

The ride ends at Mill Hill Broadway station, on the Thameslink line with direct services into St Pancras and beyond. Easy in, easy out. The kind of ride that works on a weekday morning for anyone with a free morning and a TfL travel pass.

What are Boundary Rides

A series of easy-going adventures exploring the edge of London, one gravel path at a time. Each route covers 20 to 40 kilometres, starting and finishing at railway stations within TfL's Zone 6, and each one links together the hidden corners, green spaces, and unexpected stories that make London's outer limits so fascinating.

Start and End Points

Start: Enfield Lock Station (National Rail)

Finish: Mill Hill Broadway Station (Thameslink)

Ride Details

• Distance: 27 km | 17 miles
• Climb: 420 m | 1,378 ft
• Percentage off-road: 70%
• Trail surface: Gravel | Bridleways | Single Track | Minor Roads
• Technical Grade: Green - Easy
• Mudometer - Some sections become muddy in wet conditions. Best attempted on a gravel, cyclocross or mountain bike when riding after rain.

Is this ride for me?

Easy (20-40 km)

Expect a gentle ride ridden at an easy pace.

With few or no hills on well-maintained gravel paths, bike lanes and shared-use paths. These rides are suitable for riders who can pedal for about an hour without stopping.

Suitable for off road bikes or in summer a hybrid fitted with all terrain tyres.

Read more about our grades here

Is my bike OK for this ride?

This route is best completed on a gravel, cyclocross or mountain bike. In wet conditions a hybrid or road bike is not recommended.