We had a mortgage agreed in principle on Monday, via Halifax with the scheme. We've been so close to being able to buy for nearly a year but just needed a little extra help so we were so chuffed.
We viewed a couple of houses that we'd had our eye on, loved one and put an offer in today
But the Halifax systems have apparently crashed today and our broker has been advised that they've taken back the offer of a 95% mortgage and will only offer us a 90% despite none of our personal finance info having changed 
I thought the whole point of Help to Buy was to allow buyers to get on the ladder with a 5% deposit so WTF is up with that?