If you are married then you can gift away to your wife, your money is hers and vice versa or should I say your money is hers and her money is hers.
When it comes to kids and gifts you have a personal allowance of £3000 per year and can use any unused allowance from the previous tax year. Gifts however are small sums if upto £250. You can gift more if they get married upto £5k as a one off. This is all outside of income tax and Inheritance tax.
But you can give away as much as you want, as long as you survive 7 yrs afterwards its classified as outside inheritance tax. The only thing you can fall foul of is deprivation of assets if you need social care, which is an mine field but if you're fit and healthy then shouldn't be a problem.
The best option and one that I have done for years is gifts out of surplus income. To put it simply you can gift away to your kids a regular amount (but it must be regular eg. every month) of money if you can demonstrate that it doesn't affect your standard of living. You do need to keep detailed records as well, but its a great option if you want to support your kids and can afford to do it.
This is a helpful guide if you want to go down that route.
https://www.gabyhardwicke.co.uk/briefing-notes-and-faqs/inheritance-tax-exemption-for-gifts-out-of-surplus-income/#:~:text=In order for a gift,one year with another; and