I think we have learned from our experiences and those of others (beeblebrox) Im not in any of the breakdown services so Im on my own at the moment. I have extra kit on board for this, ie

1:The standard repair kit.
2:An additional "Airman" kit with compressor and repair fluid. This is a better quality kit than the standard.
3:"Tyreweld" Heavy duty tyre repair canister.

Despite going over the top with 3 kits on board Im still worried about big holes which the kits wont mend. Im after buying a fourth kit where you insert a piece of rubber ito the hole first with a special tool, then inflate with the on board kit.

Over the top or what!