I disagree, £23 a week in 1976/77 was a reasonable wage if you were only 16/17 at the time, I was an apprentice at the same time & I was on £19 a week, mate was on £17, pit moggies were on about £28 so £23 was good.
After working for Mrs Wilson (#36...can't link) I got my first 'proper' Saturday job, working at a health food shop, and it would have been around that time and as it happens I would have been about that age, and I was paid £4 for the Saturday. After 6 months or so I got a new Saturday job, working in a west end department store, and near-doubled to £7.50. And I'm pretty much sure I got paid the same rates when I worked there full time in the school holidays, so it would have been a lot more than £23 a week. But that's The Hell That Is London for you.
I sold toasters. And hoovers, and steam irons, and electric carving knives (for people with a low effort threshold... see also 'electric can openers'). I tried to get people to buy Electrolux vacuum cleaners. I wasn't on commission or anything. I just thought they were better machines than, say, Hoovers. We used to sell heated food trolleys. Hostesses I think they were called. I got my mum one in the sales, cheap, because it had just a slight dent. I think she used it once. Talk about a waste of space. Most of the stuff we sold was British. Quite often, by paying maybe a third more, you could get the German equivalent (Rowenta, Bosch) which was always a good idea. The German stuff was better. I guess it's probably all Chinese these days.
I once had to check John Cleese's Barclaycard because it was over £50. It was ridiculous. I had to ring up and get a code because John Cleese was spending more than £50. I had to spell out the name over the phone. "Yes.....yes....C. L. E. E. S. E. ...... yes £58.98.....£58.98....yes...." He was fascinated by the whole process. Now I look back on it, maybe his 'interest' was actually taking the piss.
I suppose with hindsight I was benefiting from living in London, which although nothing like as expensive as now, in terms of property - either as a renter or owner - was still a relatively costly place to live, without having to pay for the privilege. I was always saving for trips away in the holidays, and paid no rent, worked all the hours, and saved everything, but I think I would have been taking home £45 a week? Something like that. Selling toasters.