With a Help to Buy: ISA, the UK Government will give you a bonus worth 25% of what you have saved when you are ready to buy your first home. You need to have saved at least £1,600 to qualify and the maximum savings that can qualify is £12,000. This money goes towards the completion cost of buying your first home.
https://personal.natwest.com/personal/savings/isa-overview/help-to-buy-isa.html

