Well done Andy, I have been so busy of late I haven't had a chance to get on here much never mind contemplate another group test. But i'd really like to try this one as we eat more Tikka than any other dish.
I always cook my chicken on skewers in the oven though and it always produces perfect results. Infact I even do my Tandoori chicken this way to. I simply preheat the oven to 250c, Tikka size pieces will cook in just 12-15 mins depending on the size. But they always come out succulent with crisp edges. But it is important to find a a way to hold the kebab skewers to allow even cooking all the way round them. If you rest them on the rim of a small roasting tin etc, I have found that the heat doesn't always get underneath so keep that in mind.
I had a recent trip into to town to shop at our local everything Indian grocery store and came across a neat little gadget for holding kebab skewers