I've noticed the BBC Weather site being bobbins recently - like the last week or two - as well. For example, they had the sun/white cloud symbol (=sunny intervals) for my postcode yesterday, and it pissed down all day. The broadcast forecasts on R4 have been pretty much spot-on though, which makes it a bit baffling.

The only equivalent to the Icelandic site I know of is the Met Office's pressure animation here:
http://www.metoffice.gov.uk/weather/charts/animation.html
and the composite chart (not animated) here: http://www.metoffice.gov.uk/weather/charts/composite.html