Ok Mr Facty 

I'm not sure how relevant it is but McLaren's long term test driver has just retired. Could Magunssen slip into that role for a season or two if Button is retained.
How do you know that those are the terms of the contract that has been signed? From the stuff I've read it sounds more like a confirmed two year deal..Jenson has 1 year deal with an option to extend
Well that was the silliest silly season ever...
Jenson Button says he hopes to stay at McLaren beyond 2015.
The Englishman was finally announced as Fernando Alonso's team-mate on Thursday after weeks of indecision by the team.
McLaren said Button had signed a two-year contract. This is for 2015 with an option for 2016, BBC Sport has learned.