This was a walk that I think will be with me for a while. The flood of memory that washed over me on the Grand Union towpath the other side of Ickenham/Ruislip heading up towards Denham. I let go of something. Walks have their own logic free of external reality. Out there nothing else matters. It’s on hold, paused, the world stops. The canal water shimmering like scales on the underside of the railway bridge. The deer plunging into the water then swimming elegantly in search of the right spot, in no hurry, despite the people watching from the towpath. The barges brought to mind The Tropic of Ruislip. I stopped for a pint by the canal. The heat was getting to me. The long road onwards felt like the exit from London and indeed it was as I saw South Bucks District Council on the road signs at Denham. Is this the most westerly point in London (vying with Uxbridge for that honour)? It certainly feels like it.

There’s a warmth to the Denham housing estates perched right there on the edge of London, looking in more than out. Woods benignly crest the hilltop. The threat posed by HS2 rears its head in Tilehouse Lane as it did on the closed section of road near the River Pinn where work has already begun. A light aircraft swoops down over the treetops to land at the aerodrome, but otherwise all is quiet.

The turning onto the South Bucks Way appears beside a wide open vista stretching north towards Chorleywood, undulating umber earth, ridges of the Chilterns in the distance. It’s only at the bottom of the field where the South Bucks Way branches away from Old Shire Lane that it becomes apparent that the rolling fields I’ve been swooning over will soon be consumed by HS2. Progress comes at a price it seems.

Through a well-engineered tunnel beneath the M25 and I’m moving towards settlements once again. Through the trees the sounds and movement of the Scout Camp at meal-time, cooks shouting out to each other, children being formed into orderly lines. I traverse that final field of tall furry thistles that brings me to the top of a private housing estate.

I’m truly drained by the heat when I flop on a bench with a box of chips and bottle of Fanta at the bottom of Chalfont St. Peter High Street at quarter past six. I study the map for the onward route. I’m too tired to tackle the next section of the South Bucks Way to Amersham. But to head for the nearest station just over a mile away at Gerrards Cross would feel like a defeat. I split the difference and make for Seer Green.

Over Goldhill Common where I passed around 5 years ago on a similar excursion at the same time of day. I buy a Fab ice lolly in the newsagent as a tribute to this memory.

A long straight path runs behind the back gardens at the edge of the village and into woods where the light barely breaks through. Pylon strung power lines buzz and crackle loudly over tall fronds of fern in a clearing before Great Legs Woods. This is now that recognisable uplifting sense of the walk’s end, not quite knowing how far there is to go but understanding the destination. The pain in the knees and hips adds to a sense of euphoria as I stop in the middle of a broad field of golden swaying grasses. There is never anyone around, the world is elsewhere – unloading the shopping from Waitrose, scrubbed up for a night out, sitting down in front of the telly. Anywhere but in a field somewhere beyond the town and the city.

A bridge crosses the Chiltern Line and now I seek the path of least resistance opting for the avenue that tops that railway cutting. I have 20 minutes before the hourly train departs and find that extra burst of speed to transport me through the last corner of woodland and along the lane to Seer Green Station – essentially an unstaffed shed beside the tracks. The platform is as peaceful as the woodland I’ve just left, the clicking of the dot matrix display board echoing down the line. There’s a moment to reflect on the journey, to feel it in my legs and coating my skin, before the turbo train eases to a stop and carries me back into London.