Sunday Walk: Newest, oldest, biggest - Riddlesdown to Coulsdon South

Book 2, walk 15
10.4 miles, 16.8km or, with shortcut, 7.8 miles 12.5km.
Difficulty 4/10
Take a trip through England's newest National Nature Reserve, a designation that will help preserve some of the green belt's finest commons, including Happy Valley and Farthing Down,
Marvel at one of England's oldest and biggest surviving wall paintings in Chaldon Church.
Trains: Get the 09:51 East Grinstead train from Victoria (Clapham Jct 09:58 E Croydon 10:09) arriving Riddlesdown 10:17.
Trains back: xx:20 & xx:57 from Coulsdon South to Victoria.
Both stations are within travelcard zone 6. A travel card out to zone 6 may be best.
Lunch The Fox, Coulsdon Common 01883 330 401. Busy, efficient and, according to their website, "oozing rustic charm and rural character". There's a possible earlier stop in Wattenden - the Wattenden Arms, open from 12.
Tea:  Chaldon Church serves tea and cakes between 3 and 4.30 summer Sundays. Nearer the station, the Poppy Café in the Memorial Gardens (across the road from Reddown Rd) is open to 3.30. There is a Caffe Nero, 5 mins north of the station at 132 Brighton Road, open until 5pm on Sundays. The walk notes also give directions to a pub, the Pembroke. (If visiting the Pembroke, note that Coulsdon's other station, Coulsdon Town, has no trains today).
Walk Directions: here. It is possible to take a shortcut in the afternoon (option a).
T=2.15