Oh, dear.
There's a World of information here …
http://www.flyertalk.com/forum/briti...ad-sticky.html
1. Yes.
2. Google Heathrow T5. It's on the right, after South Security.
3. If you're British you have several options. IRIS [which you probably don't have], an e-Passport gate [if you have e-passports] or standing in line. If you're Foreign … welcome to the UK.

4. See link
5. See link
6. See link
7. Yes … food is continuous. By 1130 it may tend towards Lunch rather than Breakfast, for obvious reasons.
Honestly, it's all there for you to read. Many hours were spent by nice people compiling all the answers. Please have a good read.