and use this speed tester then scroll down the page and carry out the further diagnostics and post back a screen shot of all the results including your IP profile for up and down. This test must be done with a wired connection.
If you have a Homehub 5 can you post the stats from 1-12 by logging onto the Homehub management pages then troubleshooting > helpdesk. http://bthomehub.home/
If you have the Smart Hub, (Homehub 6) can you go to hub manager then advanced then technical log and post the stats. http://bthomehub.home/
Is there any noise on your phone calls? Dial 17070 and select option 2, there should be no noise between the announcements.
If you have tried connecting to the master socket test socket and your problem is still there it would indicate that if there is a line fault it is not with your side of the master socket and you would not be liable for an engineer call out fee.
When you use the test socket make sure that any telephone extensions you have are "dead". There should be no dial tone at any of your extensions. If they have a dial tone it means you have star wiring and that is not good for Infinity.
Is that the connection speed shown in router stats or download speed shown when downloading?
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