I'll kick things off
Llanelli Waterside 1/2
Method: Chip timing, but no mats at the two turns. Run slowly to mile 2, sit down, tie your laces or have a pee in a bush. In a few minutes the runners come back from the turn, which is at about 3.5 miles and you just nonchalantly join back in, going the other way of course. Can be repeated at mile 10.
Gain: 4.5 miles
Dishonesty factor: 7/10
Kruff Cardiff 10k
Method: At the start, just walk really slow. No need to run or anything. Just tag along with the walkers right at the back. When you come to the entrance to the park, which should be about mile 1 the marshals will have lost patience and will send you off as if you have re-entered the park at about mile 4. Time to start running, only 2.2 miles to go !
Gain: 3 Miles
Dishonesty Factor: 3/10