For all UK Mil aircraft there are HIRTA (High Intensity Radio Transmission Area) avoidances for the different bands of RF TX - each Release to Service will detail how susceptible the aircraft systems are to various signal strengths in those bands and mil maps are marked with the HIRTA avoids.
There are plenty of places in UK where you can't fly a mil helo due to the HIRTA restrictions but civilian helicopters can just blat through them.
It is systems like FADEC, AFCS and weapons (or even a hoist with an electrically operated cable cutter) that are susceptible.