Length: About 10 km (6.2 miles) to Twickenham, 15 km (9.3 miles) to Richmond. Toughness: 1/10
Take a Piccadilly line tube to arrive at Hatton Cross (TfL Zone 5/6) by 11:00. It's a 45 minute journey from Leicester Square; if necessary, use the TfL Journey Planner from your local station. Meet upstairs in the ticket hall.
If you finish at Twickenham (Zone 5) there are five mainline trains an hour to Waterloo, at xx:01, xx:03, xx:23, xx:32 & xx:53. These all call at Richmond (Zone 4) around five minutes later. There are no District line trains from Richmond this weekend but the Mildmay (Overground) line is operating.
On the SWC site this River Crane Walk is shown as an out-and-back walk from Twickenham, but its northernmost point isn't far from a tube station so it can also be done as a linear walk – unless it's scuppered by problems on the Piccadilly line, which is what happened when I tried posting this variation 2½ years ago.
It wasn't really designed as a club walk so there aren't any designated lunch and tea places as such. There are cafés at the Shot Tower and in Kneller Park which function as pit stops; if you want something more substantial there are plenty of eateries in Twickenham as well as some appealing riverside pubs at the start of the optional extension to Richmond.
As usual there's no walk leader so please download the GPS file and/or the route map from the L=swc.376 page since navigation isn't entirely straightforward in the few places where the river is out of sight. For the extension, simply make your way to the River Thames and turn left.
NB. The SWC page lists the main features en route but you might also like to check out the notes and directions in this pdf document produced by Inner London Ramblers, since part of the River Crane Walk overlaps with Section 9 of the LOOP.
This walk's author tells me that the River Crane Walk made an ideal lockdown outing: from Twickenham station you could go out and back along a thickly-wooded stretch of this urban tributary of the Thames and soon imagine yourself in a much more rural environment. Noting that its northernmost point isn't far from a tube station has led me to try out this linear version of the walk, with an attractive stretch of the Thames Path as an optional extension.