Help to Buy ISAs are designed for those buying their first home. It is a cash savings scheme, where the government will boost your savings by 25% when you complete the deal. (This is capped before you get too excited...)
You can save up to £1,200 in the first month, and then £200 per month. The Government will stick in £1 for every £4 you save, up to £3,000.
The definition of first-time buyer is strict – it is someone who has never owned an interest in a property, either in or outside of the UK. They are an individual product, so if two first time buyers purchasing a house together save up £12,000 each they get £3,000 each from the Government and have a total of £30,000.