I don't get that argument though Edam. When I first had a nanny, I wouldn't say my salary was even above the average for London. It was just that it was the only form of childcare that worked for us (and with both of us working, it made it more affordable).
I think it's a common mistake to think that people who are the wealthiest have nannies (I'm not saying you don't have to earn a good salary because you do).
As far as I am concerned, the wealthiest people can afford the cheapest form of childcare because they have huge houses and can have live-in childcare like au pairs which cost virtually nothing compared to nurseries, childminders and nannies.
That, for me, is the biggest inequality.
Also, those earning under a certain amount get working families tax credits. My sister gets this and it is a big boost to their income.
The people who end up paying the most are the middle earners who don't have huge houses but work silly hours and don't have family help so have to use a nanny to be able to work. It costs me so much to have a nanny, it's barely worth me working but I do it for the long term benefits and because, as my children get older, we will be able to scale it down at some stage!
(as for the argument as to why it isn't deductible, nor is travelling to work. It isn't the only expense for working that isn't deductible).
They would never do it anyway (I don't think) because it would cost them too much and it would be open to a lot of abuse.