Hi Char15,
Please have a look at the guidance here on making regular payments:
Rules on giving gifts
The guidance advises,
'There’s no limit to how much you can give tax free to another person, for example to help with their living costs, as long as (1) you can afford the payments after meeting your usual living costs and (2) you pay from your regular monthly income'.
The guidance does not stipulate what the gift must be used for.
Thank you.