Try just typing the name of the city and then hit the enter (return) key.
That will also try to validate your town, and if it has multiple towns with that name in the database, it will give you a drop-down selection box.
I just checked Ulverston again - no luck though!
Any larger towns near you?
Besides, what do you need a weather guide for Britain for? Just hold Command+Option, click on the weather graphic and manually choose between drizzle, rain, sunshower, fog, sleet, overcast....
I just typed in Munich at first and was told it was snowing outside (we had 28°C here yesterday,...) until I selected Munich, Germany from the list.