Didnt Pete have his own tandoor?
According to Pat Chapman a tandoor gets up to temperatures of 370 degrees. Which is hot but not as hot as a clay pizza oven (some use wood others use coal). The pizza places around stockholm which use an electric tray type oven cook at 320 degrees ( ive checked the termometer on the outside). But both use the idea of really high temperatures and clay, which absorbs moister and retains heat. If you look at the shape of a pizza oven and a tandoor youll see they are both designed to let intense heat circulate, this increases the heat i think, thats why fan assisted ovens need less heat to cook food than a standard oven. Its a shame your standard oven doesnt get hotter than 260 degrees, but i guess youll have all sorts of problems with trying to get rid of that heat.
what a pizza stone will help do is to retain some of the heat when you open and close the door, also contact heat from a hot stone or a hot iron frying pan (which i sometimes use) or a tava also helps to inject heat. But if you want to get it right youll have to buy a home tandoor, or make one.. but the main problem for people is where to use it.
Regards Ashes