Essential thinking about your post
Most cleaners and gardeners are self employed. Changing it so that all people who have cleaners have to be proper employers with contracts and tax and NI and holidays and everything is unlikely, surely?
If they stay self employed then up to about £5K a year they pay no NI, over that it's a nominal amount. The people who use their services pay them directly and it is up to the self employed person to declare for tax purposes etc. The people employing them do not pay any NI for them.
If they are going to change it so that all cleaners and gardeners etc have to be employees of each person they work for, rather than self employed, it would be fiendishly complicated and I suspect a lot of people would rather do the work themselves rather than take on all that paperwork and responsibility.
So really, how is this supposed to work? I don't see it making any extra revenue for the govt at all.