It's probably part of an old Home Guard "Stop Line". As part of the defence of the UK various stop lines were drawn on maps and fortified. The fortifications would be occupied by the Home Guard and home based units of the army. The concept was based on a fighting withdrawal strategy whereby each stop line would engage the Germans until almost overrun before withdrawing to the next position.
These bunkers were sometimes grouped together overlooking features which would be used as a killing zone for maximum effect.
As Surrey formed part of the potential front line I am of the opinion that's what this signifies.
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