Hundreds of quid, at any rate. But for the other hazards (radon, flooding, contaminated waste), one is told that there is something that one needs to know and must pay for. Radon - more than most areas but not enough to merit special attention. Flooding - I'm almost at the top of the North Downs, with nowhere above me to be a source of water. Waste - as far as I can make out, a small pond a farmer has put stuff in on another side of the slope.

I've been looking at old aerial photos - it looks like my depression just might be where a tree used to be, but the guys haven't lined up the old photos exactly correctly, so I'd have to buy a hi res one to be sure... only £30. There should be at least 8 metres of overburden on the soluble stuff, anyway, so I'm not bovvered, me.

Penny