https://twitter.com/intent/user?profile_id=&screen_name=mollstam&tw_i=276018515683704832&tw_p=embeddedtimeline&tw_w=275739844716662785
Boom Solved. Save this link. its the twitter feed of the chap who looks after minecraft. As I thought is seems to be an issue with the login servers at minecraft.net
if you like me and have legit copys of minecraft and play on authenticated servers. this will be your problem. plonk your bums down and wait till its fixed.
hugs and kisses