I live on £490 per month for me and my daughter, after bills and essentials. So that covers food, petrol, random spends and all hobbies and activities for the two of us.
It's a relatively comfortable existence. Things like extra celebrations, being invited out for meals or buying gifts for people, can throw things off a bit, but if there are no 'surprises' then we get by well. DD does a lot of different classes and clubs to keep her busy, and we have a swim membership for any days that we have nowhere else to be. It's nice to always have that budgeted-for back-up activity that we can turn to on any day, knowing it's essentially free to do.
I do think we could spend less on food, if I had more time and energy (and if I wasn't such a fussy eater), though. I struggle with meal preparation so I turn to pre-made kits and sauces quite a lot, which I wouldn't feed to DD, so I don't tend to be able to cut costs by preparing meals in bulk that suit both of us. Grocery budget is £55 per week, but that can include convenience foods and more expensive products to ensure that I'm meeting her nutritional needs and not making anything too complicated for myself. I think if I were able to cook from scratch and make healthy meals that way, that I felt able to eat, then I could probably save a bit buying raw ingredients rather than my current strange balance of prepared meals and luxury products. If I had multiple kids, this would be the biggest issue. Cooking from scratch can be more effectively and cheaply 'scaled up', whilst my way of buying cannot.