I believe there was a court case in Europe (Belgium I think) where a shooter took the police force to court for hearing damage because they wouldn't authorise him to have a moderator and won on H&S grounds.
I don't know the exact circumstances but that's the gist of it.
Anyway, since then the UK police forces have become far more accomodating to the use of moderators on full bore rifles, in fact, I don't know of anyone having an application of a moderator refused. Perhaps Adi or someone more in the know would be able to shed some more light on that.
Obviously, as Oakleaf says, the 'Good reason' clause needs to be upheld.
I suppose it's arguable that shooting only on a range is less of a reason because everyone else would also need to use moderators to get the benfit. Otherwise you'd have to wear hearing protection for thier guns rather than your own.
However, if you're stalking there's usually only one or two guns being used so it's easier to make sure they all have mods on.
When I applied for mine I just said I didn't want to wake everyone in a five mile radius at 5 in the morning !
In terms of using a stalking rifle and moderator on a range for zeroing :
This is perfectly legal and you can (and should) also use expanding ammo on the range as well (as long as the range is certified for it).There's no point in zeroing your gun using different ammo to the sort you're going out stalking with !
Your ticket should say something along the lines of 'for use on approved land and ranges for zeroing' I can't remember the exact wording and I haven't got my ticket infront of me but it's along those lines. If it hasn't, I sugest you contact your Firearms dept. to confirm and get it changed.
BUT you can only zero using expanding ammo, if you enter a competition using expanding ammo you are no longer zeroing as part of your stalking activities and therefore the ammo is subject to section 5 regulations e.g. it's illegal.
I zero on a range with my full stalking kit - rifle, scope, moderator, bipod and expanding ammo laying next to the target shooting boys with their open apiture sights, eye patches and single point slings.
I was going to enter a target comp using my kit in F class (which allows bipods, scopes etc. until I realised I'd have to use solid ammo which means re-zeroing...)
Hope this is clearer than mud !!!
Cheers
Mark