Thanks for all the useful help Whoopi.
1.Regarding the staying for 6 months and then coming back a short period later like the two weeks you mention, what kind of things would be best to have ready for customs in case they need proof of ties to UK?
2. Also if I applied to extend the visa and was refused would that have a detrimental effect on trying to re enter for another 6 months a couple of weeks down the line?
1. Property... family.... return ticket... and financial proof that you would not be looking to work illegally.
2. And yes, I believe it would.
Can your partner visit you in the UK if necessary to establish 12 months cohabitation?
The other route is conjugal but this is usually more difficult to establish... I'm sure there a thread on here somewhere.
I figure you can be honest without giving your life story of which is not written yet - if you re-enter after a few weeks because you are travelling with your g/f I can't imagine you would be interrogated too much :o)