Help to Buy (Mortgage Guarantee Scheme)

Hi,

If for example i wanted to purchase a property in January (when this scheme goes live), for 100k and i put down the 5% deposit of 5k, would i have to secure a mortgage for 95k or would the 15% goverment loan be included thus the mortage required being 80k?

Sorry if this matter has been discussed already, did have a search with no joy.

Thanks