This is a lovely walk through the charming village of Harrow-on-the-Hill, home of the famous Harrow School and much more. Although Harrow is some way from the centre of London, it is easy to reach.

The best way is to buy an off-peak Travelcard covering zones 1 - 6. Take the Jubilee Line northbound to Finchley Road. Here cross the same platform and take a Metropolitan Line to Harrow-on-the-Hill. The quickest is a fast Amersham service, but any Metropolitan Line train will do: the Metropolitan LIine takes the same route as the Jubilee Line, but bypasses most of the stations where Jubilee Line trains stop.

On reaching Harrow-on-the-Hill, climb the stairs from the platform and turn left. Exit the station through the south exit leading to Lowlands Road.

This is a short walk of less than 2 miles. It's more of a stroll but there are some hills to climb and descend at the end. You are rewarded with fine views over London to the north east and the west.

Harrow-on-the-Hill is all about Harrow School - second only to Eton College in prestige amongst English public schools. It was founded in the late 16th/early 17th century. The school does not provide all the history on this walk however. We pass the site of the first fatal motor vehicle accident which occurred in 1899. We see where King Charles I watered his horses at a well, and wistfully looked back over London before riding north to surrender himself to the Scottish army. We enter the lovely old church of St Mary. Originally consecrated in the 11th century by St Anselm, the present building has some wonderful effigies, 14th and 15th century brasses, and is the burial place of the founder of Harrow School John Lyon and his wife.

Somewhere in the grounds of the church, Lord Byron's daughter Allegra is buried. All that remains is a commemorative stone by the main doorway, but nearby is a plaque by the Peachy gravestone where the young Byron as a schoolboy spent hours under the trees, gazing into the distance, and developing his muse.

Why Well, Well, Well? Well! - because we pass a number of places where there were wells and spas. In fact, at the Clerk's Well you can see the original well behind glass. The parish of Clerkenwell was named after this source of water, which later became a pump to service the neighbourhood with clean, fresh supplies from a nearby spring. Unfortunately this tap became polluted and had to be shut down, possibly from the nearby Smithfield Meat Market. Another well is Brideswell towards the end of the walk and Bagnigge Wells comes between King's Cross and Farringdon. So - well, well, well it is.

This walk is not the most beautiful I have done, but has a great deal of historical interest. We start at King's Cross (Victoria, Northern, Piccadilly, Hammersmith & City, Circle, Metropolitan Underground lines, mainline railways, Thameslink Zone 1) and finish at Blackfriars (Circle, District, Riverboats mainline railways Zone 1).

The route follows the line of the old Fleet River, now underground. For some of the way we also follow the line of the railway tracks as far as Farringdon. We pass the big London sorting office at Mount Pleasant belonging to Royal Mail. Near the Clerk's Well we pass Clerkenwell Green and the Parish Church. This is a handy detour especially if you are hungry. The church and green is on another of my walks through Clerkenwell and the Smithfield Market. We pass over lands once the property of the Bishop of Ely, and under Holdborn Viaduct where you can climb the steps to the road over and admire the view.

Another stunning view is from the dip where Farringdon St intersects with Fleet St and Ludgate Hill. The Wren cathedral of St Paul's is visible here and earlier on in the walk, and you can also walk up Ludgate Hill and visit the tiny Wren Church of St Martin's. On the right is Fleet St once associated with the British newspaper industry and journalism.

We now pass St Bride's Church and learn about the Bridewell Palace. The walk finishes at Blackfriars near the 1931 Unilever Building, on the noisy Riverside Walk beside Blackfriars bridge, with fantastic views across the Thames as far as the London Eye and Westminster.