I recently gave some details of how I analyse this, looking at the shifts in votes - e.g. how many people who voted for party X at the May 2010 general election plan to vote for party Y.
Now, YouGov are not the only polling company. Among others, there is Populus, which is now producing political opinion polls again. Looking at the timing of the last 3, it looks like there will be 2 a week - contrasting the 5 a week for YouGov.
Like YouGov, Populus splits Great Britain down into 5 areas, which more detailed share of the vote for these. Some are clear, some not. Scotland is, well, obviously Scotland; I assume the South East is London, South East England and Eastern England; Midlands is West Midlands and East Midlands; North England is North West England, Yorkshire & Humberside and North East England; while Wales & South West is presumably Wales and South West England. I outlined what I think the YouGov areas are a couple of months back.
With this, we can compare which areas the regions/nations are in:
|North West England||North England||North|
|Yorkshire & Humberside||North England||North|
|North East England||North England||North|
|Wales||Wales & South West||Midlands/Wales|
|Eastern England||South East||Rest of South|
|South West England||Wales & South West||Rest of South|
|South East England||South East||Rest of South|
By having the area defined differently, we should be able to pick up nuances.
There are 2 or 3 other polls that come out montly - what might be a reasonable thing to do is to each month look at a "poll of polls" that takes the average of each constituency's results and uses this to determine an overall result.