Yes, you can physically run ethernet, Cat5e or Cat6 is ideal, nothing below that, and anything above it is a waste of money.
You can have up to 4 devices connected directly to the Hub3. If you need more then you can buy a gigabit "switch". An 8 port gigabit switch would run about £15-£30 but budget ones can be had for less. The Hub3 is limited to about 250 devices across the WiFi and LAN combined.
---- I do not work for VM, but I would. It is just a Job. Most things I say I make up and sometimes it's useful, don't be mean if it's wrong. I would also make websites for them, because the job never seems to require the website to work.
Many thanks for your reply and the specs you have given me.
It would be only one PC (besides the TV). I want the PC on a dedicated broadband line with the fastest broadband capability. I trade Index Futures (part time) and so need the fastest broadband to give me the fastest trade execution possible.
I would run all other devices (1 PC, a laptop and mobile) off another broadband/wifi - BT broadband.
Many thanks to you and all other posters that have answered my query - really helpful.