Mortgage application / buying a house?

Mortgage application / buying a house?
Added (1). Here in the UK, you can borrow max 4.5 x your salary.
An estate agent told me that they can register me with the inland revenue to show I have been self employed to show make the up the other income for my mortgage application. I will obviously have to pay tax on this amount but then it is kind of 'legit'

I walked into another estate agent and was told there are other ways which are also 'legit' but I dont have to declare myself as self employed.

Anyone like to shed some light? Thanks
Added (2). Fraud or legitimate alternatives?

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