(Duj) Yes, it's chalk, which is why there are no rivers on it, just hundreds of dry valleys. The water sinks in to become groundwater and is in effect a huge subterranean reservoir from which the water is drawn via boreholes. The problem is that it takes ages to top up again after a dry spell but short-term fluctuations tend to be ironed out. (Projoy) Certainly won't give you a running sore.
I am ON a chair as I type this, mainly because I'm still in my officey place working and not just lying on a bed with a laptop like sensible people do at this time of night.
[Tuj] Then allow me to make up for your modesty by shouting about my fortieth birthday which is on Sunday. British Grand Prix day, dammit. Garden party planned - Pimms with all the salad, chilled sparkling stuff, iced coffees, canapés etc... all welcome. Bring presents. [Chalks] I was in bed with a laptop, as it happens, enjoying the BBC's 'Listen Again' features - a Hannay novel, 'Greenmantle' and then the programme about the life of Wellington. Brilliant stuff, and all usually bradcast while I'm at work. Only 25 years until I retire - I'm almost halfway there!