We've written before about what a great deal Help to Buy ISAs are for many people. Since December, they've been on the market. The principle is fairly straightforward - save a steady amount of money each month (you can make a bigger initial deposit) and, if and when you use the money for a deposit on your first flat or house purchase, the government will top the amount up by another 25%. There's more info here.
Although of course it's sensible to shop around for the best interest rate you can get, in actual fact if you don't get the very best deal it's hardly a disaster - it's the 25% uplift that's the key thing; it massively outweighs whatever relatively trivial interest you might get on your money whilst you're saving up. There's no other risk-free investment that will provide you with a return like that. Of course, if you end up withdrawing the money and not using it for a property purchase you don't get the 25% - but you do get your money and the interest you've earned back, and you can move it into a Cash ISA. There's some complication around opening a Help to Buy ISA this year when you've got a Cash ISA already, but it can be done.
For those who qualify, and for whom it might be useful, it's a brilliant deal - if that's you, look into it!