Length: 21.5 km (13.4 miles) 7/10 but several shorter options
I posted this walk last year for orchid-spotting purposes and there should be prolific wild flowers in the first half of the walk on the east side of the Darent valley. There are numerous other attractions including picturesque villages, a vineyard, lavender fields and if you walk fast enough to make the entry times, a birds of prey centre and a Roman villa. There is a shorter afternoon option staying in the valley which goes last Lullingstone Castle (cutting out 2.7 km).
Travel: the quickest option is the 0955 from Victoria, changing at Bromley South on to the 1023 to Sevenoaks, arriving Eynsford at 1041. This second train is a Thameslink stopping service so you could pick it up from St Pancras (0937), Blackfriars (0946), Denmark Hill (0958) or numerous other stops. Returns at 05 and 35 - there will be options to change on to quicker trains on the way back too.
Lunch: the suggested place to stop for lunch is Otford, after 8½ km. The route joins the High Street opposite The Bull (01959-523198); the alternative is a traditional village pub overlooking the pond, The Woodman (01959-522195). If you do a shorter route, there are several options in Shoreham.
Tea: in Eynsford, the suggested place is The Plough (01322-862281) which has a fine riverside location. A short detour along the main road will reveal the Malt Shovel Inn (01322-862164), the Five Bells (01322-863135) and the Castle Hotel (01322-863162).
On the shorter route a convenient place for a mid-afternoon break is the Lullingstone Café in the Country Park Visitor Centre (01322-865995; open to 5pm summer).
Short walk options: there are a number of variations on the walk page including the shorter afternoon mentioned above. But as the walk passes through Otford and close to Shoreham, both of which have stations, it would be possible to finish at either of these. You could also miss out Otford by going directly from Romney Street to Shoreham on the route of the Otford Circular walk (CW1–43) and continuing with the afternoon route from there (14km).
For walk directions, map and GPX click here
T=SWC.59