Hi,
it doesnt matter if they are firing, because it's only the danger area that they do that, and your not allowed in there any time of the year (except for like xmas day when they've all gone home)
And the danger area is very clearly marked with signs on the road saying if you go past here your likely to DIE... so theres no mistaking them !
there are plenty of lanes and byways (all legal) and whats more there are no ramblers to moan because its the army, and you can't get told off for tearing it up, because they are tank tracks ! (and believe me a tank tears it up a hell of a lot more than a landy) but its very scary when you see one haring along, especially if your stuck !
If you have an OS map, you'll see the danger areas marked by red stars.
Dan