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The fibre part is only to the cabinet in the street. From the cabinet to the house it is just the normal phone lines. The Homehub 5 has an integrated modem so you do not get a separate modem now.
Use this speed tester then carry out the further diagnostics and it will show your IP profile for up and down. If you are on Infinity 1 it will show an up IP profile of 10Mbps or if on Infinity 2 it will show an up profile of 20Mbps.
http://speedtest.btwholesale.com/
The speeds you have said they have is pretty poor and will need further investigation if they are on Infinity.