I hope I'm wrong, but as I understand it SSP is just shy of £100 pw. That goes nowhere near covering the rent of even a small flat in London, let alone food/bills etc.
So if you are sick for more than a week or so, what do you do? Can you get benefits to top up? What happens if you can't work for a month, or 3 months?
Asking for a relative who is really worried about losing their home.