In reply to Bobling:
I think there might have been a problem with the rainfall layers yesterday?
But in general I go to a forecast, click on the 'weather map' bit and then click the 'show layers' to get access to rainfall. Clicking the 'map for last 24 hours' at the top left gets you the observations map, which is useful to watch the rain coming in...
Actually now that I have a look it seems to have reverted to the older version on the homepage but still go to the newer version when you click through?