Employment Discrimination Lawyers and Labor Law Lawyers

I'm working regularly (five days a week) and my income is less than £6000 per year. The trouble is that my employer (which is a private family) is not still declaring my employment to the government. I think that this is not fair (and maybe illegal too), so I would like to notify to the government that I'm working, in order to avoid any future problem. If my employer don't want to do her job, at least I will do my part.

Someone told me that there is a government website on which I can declair my job status. Does anyone know which one it is?

I don't really know how the law works in the UK, but if a situation like this happens in my country (Italy) both of us will be in trouble. I really want my peace of mind.

Thanks all for your kind help.