The Budget 2016 announced a new “Lifetime ISA” that will be available to those aged between 18 and 40 from 6 April 2017. The Government will add 25% to the amount saved subject to a maximum of £4,000 a year (plus £1,000 from the Government). It seems there will be no requirement that the savings come from the person named on the account so parents, grandparents, or other relatives could make payments into the account.
Where you have excess income and have concerns about inheritance tax (IHT), why not take advantage of the exemption for normal expenditure out of income by committing to regular payments into the account?
£4,000 a year would save you £1,600 IHT, so £2,400 net turns into £5,000 gross, per recipient!