wow - so many different opinions
I was going to ask for £25 a week, or £100 a month, and then another £100 which would go into a savings account for when he is older.
he isn't currently at college or any other course, training, voluntary work etc.
and I pay his mobile phone bill which is usually £35 a month
so maybe I should charge £35 for his phone & £40 for gas and electric, and something for food - £60? = £135 a month. he can easily go through a litre of milk a day, plus eggs, cereal, bread, pizza, fruit, pasta, cheese, vegetables etc. he's got a mega metabolism
he's going to be working 4 hours a day, 6 days a week, so I assume he'll still be eating most of his meals at home.
should I expect him to save some of the money himself, rather than me doing it for him?
I know he'll fritter the first few months wages away. I know I would in his position.
he's talking about driving lessons etc, but that's something for a couple of months time as they are expensive.
I'm not trying to make money from him, just to make a contribution, and tbh the past few months since he was asked to leave college have been difficult, as he has lacked motivation, and some days was just getting ready to go out at 4pm as I was getting back from work, having left the kitchen in a total tip 
I glad he has found something productive to do