So with one whole log, you can either do minion method and place a log over the top of the coals which reaches to either end of the charcoal basket. This provides a nice slow smolder and doesn't burn as quick as chunks. you have to be careful with space if its a super long cook and basket is maxed out, but I seem to fit it in
Another method I have tried is to place the chimney coals at one edge of the basket so the fire effectively burns across the basket. With a log on top of this, the log smolders with it. Works really well, especially for woods that burn quick like cherry or apple. To be honest, having tried all sorts of woods, I personally now prefer oak and beech, I like the stronger wood taste.
Sounds like I need to invest in some decent briquettes, my Tesco ones are likely letting my food down. Thanks for the pointer. As for the event, I will check it out.
Cheers!