Day 242/20. I found it at last.....

Ashley Range is a former World War II bombing range in the New Forest, to the west of Southampton.
As well as a high and low altitude bombing training range, it was used as a testing range for the Barnes Wallis's Grand Slam bomb and also the Bouncing bomb used by the Dambusters.
There are numerous relics left to be seen today, 80 years later, on the site of the ranges, although much has returned to nature. I know where there are  Grand Slam bomb craters, a mock up of a German submarine pen, trench systems, observation shelter, railway line mock up, air raid shelters and huge concrete circles used as bombing targets. I knew where all those were, but had never before found the white concrete guide arrows that would direct the bombers onto their targets.
I sort of knew where it was, and found it today on a longish walk through the New Forest, about 1 1/2 miles from the nearest road.
Great fun.