Here is a summary of the latest NWP output for noon (GMT) on Friday.
Issued 0446z, 4/09/10.

A trough is likely to cross the UK during the weekend, resulting in
rain spreading eastwards to affect all areas.

ECMWF: http://www.wzkarten.de/pics/Recm1201.gif
Southerlies cover the UK with a low to the NW. There's little change
on day 6, buy by day 7 a trough crosses Scotland and westerlies affect
the UK as a result.

MetO: http://www.wzkarten.de/pics/Rukm1201.gif
The Met Office run shows a trough to the west and southerlies for the
UK. The trough moves eastwards on day 6, with WSW'lies following
behind.

GFS: http://www.wzkarten.de/pics/Rtavn1201.png
The UK lies under SW'lies, ahead of a trough to the west. This moves
eastwards on day 6, with westerlies for all. A weak ridge brings
WNW'lies on day 7.

GEM: http://www.wzkarten.de/pics/Rgem1201.gif
SSW'lies cover the UK due to a low to the west.

JMA: http://www.wzkarten.de/pics/Rjma1201.gif
As with GEM, a low to the west brings southerlies for all.