I took the opportunity to visit this barrow while taking some photos of East Hill barrows. The maps and MAGIC etc show two, but I could only spot one of them. Some of the barrows in this extended group along the South Dorset Ridgeway are very slight and hard to see, I suspect that may be the case with the other barrow.
The visible barrow is quite a curious example as it seems to have been turned in to a water tank holder. This appears to have been done to it some time ago as grass has grown over the concrete lid.
The White Horse is 18th century and depicts king George the 3rd on horseback, he was responsible for making nearby Weymouth a fashionable resort and popularised sea bathing.