Legal criteria once you get a DH Visa for UK

All the criteria for bringing your DH to UK are in the site www.ukvisas.gov.uk. There is an application to download for a domestic worker in a private household and if you fit the criteria and provide all the supporting documents you can get a 6-12months visa within a day.

The hard part is figuring out what to do when you arrive in London. As the visa is not a proper work permit and specifies that she is not to receive any public funds, can anyone with prior experience let me know if I need to set myself up as employer under the PAYE system with minimum wage guidelines, pay National Insurance for my DH, and whether or not she needs to fill out a tax form? I have contacted every single government department and helpline and no one has the answer. I already pay her substantially more than in HK and provide for all living and travel expenses. Many thanks, KAD.