Dont you have access to a club/range closer than Bisley?
Luckily we are only 50 miles away but 3 or 4 of us try to get a mornings practice a month - 3 or 4 to a target, works well for shooting, spotting, fiddling, discussing, advising, refiining - takes the pressure of the competitive element out of it - and works out fairly low cost.
The great thing is it allows familiarisation.

John