Just watched this on channel 4 online, very funny, I really enjoyed it for it's mundane-ness.
As for sharing it with your daughter, as a lone parent, it's rather hard not to isn't it? When you are together 24/7 and absolutely reliant on each other, I think honesty is the only way. Although my daughter was 12 when I told her. I think you have to address the 'if' anything happened to me, she would be an absolute wreck knowing I had kept something from her, because our relationship is so close.
At least it's one documentary that showed sex workers/punters without glamourising the job. Oh for the glamour of that jacuzzi though!