There are many many a bog trotter in the UK military and there are ways and means of checking you out.
It might takes a few weeks extra but it shouldn't be a problem.
We had 4 lads from your neck of the woods in my TA unit and they didn't have a problem. Turned out one of them had a player as a cousin which he didn't know about, and he still got his clearance through the same time as the others about a week after the rest of us.
And just to note that 100 quid an hour personally I feel is quite a good rate and if it includes a landing card is still cheaper than you will find else where in scotland.
But unless you are going to burn the whole ten hours in under a week please don't pay up front.
And for the others the article in the courier is now on
line