Felly sgrifennodd Dave Ludlow :
The return period for
such an occurrence is, again, roughly once in 200 years."

For any one given place (or specifically for this one location), or for
the whole of the UK? It makes a big difference! If for any one given
place, that's not so amazing.

Adrian
--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais/weather/ uk