Jelly Bugs in Kingston does a decent little sandwich/lunch pack for kids at reasonable prices - a basic s/wich, fruit, non-sugary drink and a chocolate biscuit or yogurt or some such - it's reasonably priced (I can't quite remember what, but IIRC around £3 or £4. Hot chocs/teas/coffees for parents and a few cakey things, although I normally only ever buy a drink. They also stock some of the Ella range for babies which makes it very visitable
If you're going to cater for 0-6 year olds, then I would have sections for ages so that the big 6 year olds aren't tearing around where babies are crawling/lying but I guess it depends on the size of the place.
bouncy castles have always been very popular with my kids (1, 4 and 5) as are puzzles and crafts/drawing as wella s all the toys - ride along toys and prams equally popular amongst my three (both genders)
I am looking to take over an existing soft play/cafe business in the Wimbledon area and I would like to understand what mothers/fathers of children aged between 0-6 years of age are looking for. Not only in mental/physical stimulation, but also in what food and beverages you would be looking for.