Hi, been a while since I posted here but always lurking 
I "attempted" the Isle of Wight Randonnee on Sunday. Can't believe, despite the weather, how much a thoroughly enjoyed it! However I feel my bike may have let me down.
After zero flats in the past 6-7 months since I got the bike, I get three in one day! Lucky I had two spare tubes with me. However the third puncture 7 miles from the finishing line done me in and I ended up walking the rest.
So I thought I'd throw out a couple of tyre/tube/puncture questions and see what the experts here think my best solution is...
1) Am I being over precautionary thinking about changing my tyres? I read somewhere that Specialized Armadillo's are supposed to be very good at avoiding punctures. Are they worth a try or should I stick with my current tyres?
2) What about inner tubes? I picked up the cheapest inner tubes from Halfords, was that a mistake? What about the ones with the slime in, are they worth the extra? Do they actually work?
3) How exactly do you fix puncture by the road side? Daft question I know but I've never actually done it! I know how to find a puncture with a bowl of water and can repair it once found. Does anyone have any easy fool proof methods of finding the hole without spending half hour pouring my precious water supply over the offending inner tube?
Thanks in advance for any advice offered.

I "attempted" the Isle of Wight Randonnee on Sunday. Can't believe, despite the weather, how much a thoroughly enjoyed it! However I feel my bike may have let me down.
After zero flats in the past 6-7 months since I got the bike, I get three in one day! Lucky I had two spare tubes with me. However the third puncture 7 miles from the finishing line done me in and I ended up walking the rest.
So I thought I'd throw out a couple of tyre/tube/puncture questions and see what the experts here think my best solution is...
1) Am I being over precautionary thinking about changing my tyres? I read somewhere that Specialized Armadillo's are supposed to be very good at avoiding punctures. Are they worth a try or should I stick with my current tyres?
2) What about inner tubes? I picked up the cheapest inner tubes from Halfords, was that a mistake? What about the ones with the slime in, are they worth the extra? Do they actually work?
3) How exactly do you fix puncture by the road side? Daft question I know but I've never actually done it! I know how to find a puncture with a bowl of water and can repair it once found. Does anyone have any easy fool proof methods of finding the hole without spending half hour pouring my precious water supply over the offending inner tube?
Thanks in advance for any advice offered.