RossToon,
Good luck with your bet tonight. I hope it comes off for you.
Personnally, I have a policy of never betting on more than 4 teams at once. So I would have split your bet into one treble and a trixie.
For those of you who don't know, a trixie is a bet where you have 4 teams backed to win and you start 'winning' your money back as soon as two of them win, more if the third wins (which would make a treble) and you scoop the full return if the 4th wins.
If only one of the four teams wins, your screwed.
Its like a safe accumulator basically.
You get slightly smaller odds in comparison to a normal accumulator but more chance of getting something back.
Riches