2) No. It may be technically superior in some aspects, but it has a lesser range and slower transfer speed than WiFi
3) Slowly, WiFi, click here for a WiFi map
Personally, I would forget the £7 and buy a WiFi-enabled router. That would give me the flexibility to connect wired or wirelessly, set up a network with complete flexibility, be platform-independent (all running on TCP/IP), and would allow me to choose from a very wide range of established suppliers.
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