Chesty,
I was away to say the same but you beat me to it. I guess if you are a contractor your sector pay is your only income. I've been sick when rostered to do a night stop, oddly enough I didn't get duty pay for both days or an overnight allowance for the trip in that months paypacket. That said I still got a basic salary (A perk of working for a company that has all its flight crew on PAYE). That said, if a self-certification form or doctor's line is not submitted then the company can deduct from the basic salary as well.