Honestly pay your tax. Listen to someone who has been in serious bother for not doing so.
When I first started escorting 6 years ago I never bothered paying tax and was earning about a grand a week too. I remember hearing from my other escorting friends that they were declaring their money etc but it still didnt make me want to have to pay taxes as I felt like it was too easy to get away with just stashing the cash in my bedroom and only paying in £800 or so into my bank every month without ever getting caught.
I managed 10 months without paying anything and then a client who took a dislike to me over something trivial ended up grassing me up to the Inland Revenue.
Well..... let me tell you what a complete and utter nightmare it was trying to sort that out! I have been paying my taxes ever since (you don't have to declare every single penny you earn but you should probably declare most of it as then you can sleep at night not having to look over your shoulder).
Look for an escort friendly accountant, register with HMRC as a self employed therapist, start saving 20-30% of the money you earn on every booking and leave it up to the accountant.
Your landlord, parents, friends, bank etc will never know anything as it's all confidential.
If you pay tax you can also do things like get a mortgage or buy things on finance (car etc) or open up an ISA.