Length: 15 km (9.3 miles), or 13¾ km (8.6 miles) if finishing at Boston Manor. Toughness: 2/10
Take a Piccadilly line tube (towards Heathrow) to arrive at Boston Manor (TfL Zone 4) by 11:00. It's about a 30-minute journey from central London. Return from either Boston Manor or Northfields, one stop nearer London on the same line.
This new suburban walk looks like another of those lockdown loops knitted together to form a decent full-length walk. There are plenty of interesting features to see on its meandering course through west London: parks, canals, locks, unusual bridges, railway viaducts, a zoo, etc. The walk directions even urge you to visit a maze so you might end up walking somewhat more than the stated 15 km.
Apart from a few cafés near the start it looks like there's a long stretch before the walk's main refreshment places: either the Brent Lodge Park Café after 10 km or The Fox pub in Hanwell after 12 km. The walk then goes back past Boston Manor station, but if you want a tea stop you might need to complete the full walk to Northfields where ‘numerous cafés’ will be vying for your custom.
You'll need to bring the directions from the L=swc.418 page.