This is the cheapest I have seen the x360 brand new.
£799 possible just by paying in full and claiming £100 back from HP.
To get the £709 simply use code KPAGM for %10 off at checkout when opening a credit account and then claim your £100 cashback at https://hpcashback.com
Simply pay off the interest free credit straight away and then you dont have to worry about any interest or credit issues.
Also potential 2.2% cashback at http://www.quidco.com/very/