mothercare have the britax max fix 2 for £137 (usually £275) through their sale preview.
If you are interested in extended rear facing seats you will know this is a great price. Keeps your child safely rear facing from birth up to age 4 /18kg.
I think you need a sale preview email from mothercare though, it won't show up on the website at this price without it
*edit 24/12/14 price now down from £140 to £137 and sale is live to everyone*