u/Getrich-or-bust

Which market do you guys recommend? The main goal is street food? Big foodie, so looking for the market with the biggest and/best street food stalls?

Visiting next week, looking for breakfast and dinner recommendations around the Marble Arc area, will be staying across Hyde Park. Family/kids friendly option preferred...also other must go to/ultimate London dinning experience recommendations, please?

I have a 2 am flight with Jetstar, I plan to be at the airport before midnight...am i in danger of having security, checking, and/or passport control closing early. Should I be there even earlier? Want to maximize my time in the city.