If you find you have to register, you could set up another company and split the work.For instance, Pressure washing = Somebodys Pressure Washing Co.Windows = Somebodys Window Cleaning Co. And so on, it's the company that has to register (sole traders too) but you can still operate several companies without the need to register if the company does not go over the limit.
you can set up 1 as a limited company and another a sole trader. this is seen as 2 separate entities