Brilliant - thanks guy's all your help is really appreciated.
....To be honest my Cardio fitness is not too good at all..! Prior to starting this new fitness program I carried out a few tests to gauge what level my fitness was at - I was shocked, it took me 11minutes and 26 seconds to complete one and a half mile run!!!! I timed myself again last night and it was just under 11 minutes, not very good at all, but thankfully it is improving. I just hope six weeks is enough time to improve in order to achieve the required standard. How many miles should I be looking to run over 3 nights a week..?
Hiya Rugby head
Dont worry!
6 weeks is sufficient time to prepare yourself.
Im an ex Physical Trainer so know a few "facts and figures" - You'd be amazed how much your fitness can improve in a short amount of time.
6 weeks is 6 weeks - yeah ok two months preperation would have been better - but then again six months preperation would be better still ....in other words the more time you have to prepare the better.
But your CV fitness can be dramtically improved even in 24 hours would you believe (although 24 hours wont be enough in this instance

)
All i'd say is do a three day work out - dont do five - you body needs time to repair itself and rest.
if you smoke try and stop or at least cut down as that will greatly aid your CV fitness and stamina.
Eat sensibly (for the next six weeks atleast) and you shouldnt have too much to worry about
In terms of you running set distances each night ....I'd practice more on the bleep test rather than all out distance if I were you.
You being 31 shouldn't be a problem - age discrimination is a big no no these days
There is absolutely no reason on earth why you could be deemed "too old" sounds to me like the new recruit you spoke to has been grossly misinformed.
We get alot of people in their thirties apply and get through - infact we just had a 42 year old qualify
Good luck