Unknown concrete slab revisited

I posted an image of this once before, but no answers came at the time. While at Hunsdon today Jim C and I cleaned this particular lump of concrete up for a better look.
It is situated alongside the main runway about 75 yards from the end, and would correspond roughly in the area to where the controllers caravan would have been.
It has a oblong recess in the centre, a conduit for wiring that enters from the side, and the stumps of three fittings made from what appears to be doubled steel tube that may,note the emphasis on may, have been the legs of a mast.
I thought I would post these clearer pics in case someone might recognise the item.

How big is that lump of concrete, Denis ? Wondered about the base for the angle-of-approach indicators. These were mounted 5 ft out from the runway, but no documents state how far from the threshold, but 75 yards looks about right. The AAI was a metal box 12 ins square and 2 ft 6 ins in length.

At Parham i saw a few of those ,(but without the metal). one was inside each building. i was thinking they were the bases on which the stove sat. i saw a war film once where the stove sat on such a base .

Graham,
I would say about 2 and a half feet square and about 5 inches thick, a green pen in image 1 for scale. I know we talked of this before but damned if i can find the thread it was in! (dont mention the search facility:))

corij,
Thanks for your suggestion, but this is not a pot belly stove base. Plenty of those are to be found on Hunsdon in amongst the rubble as well.