Here are the latest poll figures as tabulated on the UK Polling Report website:
It really does look like a two party race and, by-and-large, that's how the market sees it.
At the best prices available you can back all four runners and break square. Leave out the also running Conservatives and Liberal Democrats and you can get the two chances at a glorious 90%! Surely that's an opportunity too good to miss.
My recommendation is to wager in these proportions - $46 on Labour at the $2.2 from William Hill and $45 at Ladbrokes' $2.25.By my calculation it's $10 for nothing and only a month to wait.
You will find details of my outstanding bets and the betting record at The Portfolio - the record so far.