The figure would have been considerably less than however much was pi$$ed down the BWoS sink on MRA4 and TypHoon...
The fact that some military aerodromes don't have ILS is a reflection of a direct failure to invest in adequate infrastructure in the past. If it's now coming home to bite, then tough. How many front line aerodromes does the RAF have left which don't have ILS in any case?
Bearing in mind that it's only the VHF (localiser) element of ILS which is allegedly susceptible to FM interference, azimuth monitoring should be OK as the glideslope is UHF. But the azimuth monitoring cannot be provided below MDH, hence ac must either level at MDH or go-around in sufficient time to avoid descent below MDH.
Which small pointy things couldn't afford the weight of an ILS receiver? The ones which can carry several thousands of pounds weight of bombs? The ones which haven't had to use Kabul, Baghdad or Basra?