The "up the bum chicken" method has been tried for several seasons here. The best results I have achieved so far have come from drinking the bier (brown morris dancer's liquids are not allowed) and replacing it with red wine. About a third of a can will do it.
The taste is subtle but the meat is very moist. Agree with Smuj, cook the chook using the indirect method with a closed lid.
LangleyB as you appear to enjoy both sorts of BBQ would you consider yourself bi?
Coff I cannot help how I look!