Here is a summary of the latest NWP output for noon (GMT) on Saturday.
Issued 0439z, 17/04/12.

Low pressure will be close to the UK for Sunday and into early next week,
with showers or longer spells of rain affecting all areas.

ECMWF: http://www.wetterzentrale.de/pics/Recm1201.gif
A large area of low pressure covers Scotland, resulting in westerlies
elsewhere. There's little change on days 6 and 7 as the low fills. On day 8
a new low moves over the UK with light winds for most. The low moves away to
the NE on day 9, leaving a SW'ly flow over the UK. There's a col on day 10.

MetO: http://www.wetterzentrale.de/pics/Rukm1201.gif
The UK lies under a large slack low, with light winds.

GFS: http://www.wetterzentrale.de/pics/Rtavn1201.png
GFS shows low pressure filling over Scotland on days 5 to 7, with westerlies
or WSW'lies elsewhere.

GEM: http://www.wetterzentrale.de/pics/Rgem1201.gif
The Canadian run brings a low to the south of Ireland, resulting in
southerlies for England and Wales, easterlies for Northern Ireland and light
winds for Scotland (which lies under a weak trough).

JMA: http://www.wetterzentrale.de/pics/Rjma1201.gif
The Japanese run shows a large, slack low over the UK with light winds for
all.