Hi Simon,
Welcome to FlyerTalk! I hope that the forums are useful to you.
You will find lots of discussion about Mileage Runs and fare deals to make mileage runs possible.

FlyerTalk and Mileage Run Deals forum is not a travel agency:

• MR Deals is only for posting up fare deals that earn miles and status on airline frequent flyer programs and alliances.
• MR Discussion is for discussing those deals and the tools for finding such deals.

These fares are specifically here to help people to book and use the airfares to get miles and status: the forums DO NOT cater to requests to get from A to B on specific dates, like yours

Here is the link to explain how the forums work:
http://www.flyertalk.com/forum/13766346-post6.html

Fare requests are not permitted.

Good luck with your search; you may find some tools to find fares in the Travel Tools forum. The Budget Travel forum may have some cheap fares or notice of some sale fares, which may also help.

You should use online travel agency sites and check with local travel agents to find you the best fares, then check on FT to see if any tools (like ITAsoftware matrix) can help you find any others.

Cheers, BiziBB, Moderator Mileage Run forums