Thank all so much for the replies.The help I have had in such a short time on WKC has been fantastic,thank you.
After reading the replies it makes more sense now.The weather did cool somewhat and the wind picked up and I did add additional trays with the vegies in.
After cutting the chicken there was small areas of pink around the joints and on the bottom,the rest was cooked very nicely,it was only in the gas oven for about 10 mins tops.
When I lit my heat beads,I placed my firelighters in the Vee of the grate,I put 35 beads into each holder and placed the holders over the lighters,the lighters where well ablaze when I did that.
I left the beads for about 3/4 hr, they where all ashed over when I moved the holders to the side of the kettle.I think my downfall was I only had the bottom vent open a bit and the top vent open fully and with opening the lid a few times and adding the two large trays with the vegies in,I think that might have assisted in dropping the temp down.
From what I had read in the cook book I have, I will take as a general guide line and not think it is the exact cooking time,which I did.
Many thanks for every ones help,as Mark pointed out,one is not belittled on WKC, irrespective of the question or how many times that question has been asked before,so I tip my hat to you all.
Cheers Andy