Anyone offering a job as a nanny or similarly low skilled employment is either scamming or wrong. ( I know which I'd assume)
Sorry to confirm what others have already said, but coming to the Uk on a working Visa is next to impossible right now for anyone outside of the EU, so I'd suggest having a look at other options.
Check out the Visa4uk website - it will confirm this and give you guidance if you are one of the VERY small percentage that might have a shot.
