1.Yes, physically but not mentally (see 3. below).
2.There is no TM on fibre.
3. CS can be atrocious. Script monkeys with not an ounce of nous of the technologies of BB.
4. Yes, but EE will send you a one-box combined VDSL modem/router. This is preferable than the BT OR fibre modem if you need to get router stats & errors in case of trouble.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC