I too have an HSBC policy, and it's very competitively priced. BUT you need to customise it to your own needs. Even as a one man band, you will occasionally have a helper. Regardless of pay rates, or not, they will be classed as an employee, so Employers Liability will be required. The standard HSBC policy does not cover part timers on Public, Treatment or Employers Liability. So, as Nick says, read the policy/schedule carefully.
Safe and happy cleaning:)
Ken