The ancient well, named after Caesar, is believed to date back to Neolithic times. It sadly dried up in the early 20th centuary, however, a boring was made slightly downhill, so the spring water now flows out of a standpipe and into a large cistern.
Unfortunately, possibly due to low water pressure, the spring is no longer continuous; it dries up during the Summer until mid/late Autumn (from about June until October).
When I first visited (September 2015), the water temperature was  12°C and the tds reading was 90 ppm.
Directions
If you are walking to the spring from Wimbledon High Street, head towards the Common and take the straight path to the right of Rushmere Pond. You will come to Canizaro Road and you simply have to cross it and continue walking until you reach Camp Road (you’ll see a pink house on the right side before the Fox & Grapes Pub). Walk along Camp Road until you reach the beginning of the golf courts. Then take the central path with a white gate, between the golf courts, called Sunset Road. Walk all the way to the end of this road and you will see a white cottage, called Springwell Cottage, to your right, and a small car park in front. The well and spring is ahead of this.
If you are driving or cycling, from the High Street, turn onto The Causeway and follow that and then head onto Camp Road and turn onto Sunset Road. You can park at the bottom and then continue on foot.
The most direct route is to take the path with the logs on the ground which is slightly to the right. Walk straight along this path and then turn left and keep going straight ahead. You will eventually reach a clearing with tall pine trees. The now undrinkable well is located in the middle. If you walk towards it and then downhill, you will reach the cistern where the spring water flows into (you should hear the water).
