I reckon it takes me at most 3 minutes to iron a shirt so £20 per hour sounds generous
I don't mind ironing my stuff. Stick the sport on the telly in the lounge at same time. Quite therapeutic
That should be about the rate for an unskilled self employed person in my opinion, though saying that ironing is a skill I have certainly not mastered. Also maybe a shirt takes 3 minutes, but 20 shirts come on I am sure it would take longer per shirt once fatigue sets in.