SS, yes we know how to do it and yes the kit can theoretically do it. Unfortunately, as I understand it, if you actually cross-couple the freqs the kit can't cope and shuts down or some other un-helpful activity.
Never had that problem at West Freugh, and that was 6 years ago (Mascot comms). I can't see the kit there being all that different - could be worth talking to someone in MOD-PE to see why it worked there.