Thanks, interesting links. I recognise exactly what you mean about the corrosive and polluting nature of many combustion products.
For Javelin Park (fairly local for me) I'm inclined to trust that our EA and other regulators get the balance about right. It had temporarily slipped my mind that the landfill tax, which strikes me as being a good way to move forward from some of the dubious practices of the past actually originated with the EU.
Intrigued at your reference to burning radioactive medical waste. Obviously, the technology you need is very dependent on the isotopes being used. In many cases the half lives are short. Presumably you were monitoring your discharges in the same sort of way that is done at nuclear power stations (and I recognise that it is much more difficult for "small" plant with highly variable throughput).