Here is a summary of the latest NWP output for noon (GMT) on Sunday. Issued 0348z, 9/08/12.

ECMWF: http://www.wetterzentrale.de/pics/Recm1201.gif
A trough covers northern Scotland and SSW'lies affect the rest of the UK. On day 6 another trough approaches from the SW, leading to ESE'lies. The trough moves northwards on day 7 and by day 8 it lies over northern Scotland, with SSW'lies elsewhere. Day 9 has a low over Scotland and Northern Ireland, with SW'lies for England and Wales. There are SW'lies for all on day 10 as the low moves northwards.

MetO: http://www.wetterzentrale.de/pics/Rukm1201.gif
The MetO run brings a trough over northern England. To the north winds are SE'lies and to the south, SW'lies. There are SE'lies on day 6 ahead of another trough to the SW.

GFS: http://www.wetterzentrale.de/pics/Rtavn1201.png
WSW'lies cover much of the UK due to a trough over southern Scotland. To the north, winds are SSE'lies. A col covers England and Wales on day 6 with southerlies elsewhere, followed by further southerlies for all but the SE and easternmost England on day 7. Day 8 sees more of the same, followed by a col on days 9 and 10.

GEM: http://www.wetterzentrale.de/pics/Rgem1201.gif
GEM shows southerlies for most due to a trough over northern Scotland.

JMA: http://www.wetterzentrale.de/pics/Rjma1201.gif
The Japanese run shows a col over the UK.

In summary, Monday will see a trough over the northern half of the UK with associated rain moving northwards. Thereafter the models diverge, with ECM bringing another trough midweek with unsettled conditions for all, while GFS has southerlies and low pressure stays to the west.

Thanks Darren.