Full fibre also known as fibre to the premises (FTTP) or fibre to the home (FTTH) means the fibreoptic connection runs direct to your home, previous technology such as fibre to the cab (FTTC) means the fibre ends at the cabinet, the remaing leg typically runs on copper or aluminum, over distance the speed degrades and can be slow if you're far away.
FTTP is typically more reliable, it's a newer network and less prone to outages but with anything in life, things can go wrong and it's not 100% fault free
This image might help explain it better - credit to broadbandchoices
Halo3+ will see you get a minimum of 80 mbps down and 20 mbps upload, faster Halo 3+ package exist all the way up to FF900
