ARRSE were looking at this in depth - turns out its for a light bulb which the MOD buys 4-5 per year, not your average light bulb.
More interestingly is the lack of MOD response to this - it usually comes out with very defensive lines setting out whats going on. Here there is nothing, no lines, no rebuttal, just silence. It feels like the first stage of a media set up - PR11 cuts anyone?