I see the Met Office have revamped their mountain weather forecast:
http://www.metoffice.gov.uk/public/weather/mountain-forecasts. Perhaps of most note is the division of the Highlands into 4 areas instead of two (more-or-less the same as MWIS, though the Met Office still does not cover the Southern Uplands). There's also more detail for the following day: wind, temperature and wind chill at 5 different levels and at 3-hourly intervals. All seems to work fine on my (Apple) phone.
The most recent version of their phone app now has rainfall radar observations/forecasts, in which you scroll through time manually rather than having them animated, and is much more user-friendly than trying to use the corresponding web pages on a phone. However, it does insist on downloading all the observation images before rendering any of them, which is a bit frustrating if you are on a low bandwidth connection.
