Well - finally got there. It took me 10 weeks because of a heavy cold in week 6, which I repeated before week 7, but it feels great to have completed it. I have realised much of the effort is in the mind, as many times I have got 5 mins in and decided I won't be able to do it, but by diverting my thoughts to something else for a while, I am suddenly 20 mins down!
Now the hard part - to keep it up regularly.
Good luck everyone!