Finally back online after my infinity connection went down last Friday.
Engineer turned up at 09:00 this morning, ran some very in depth tests, with his JDSU tester, he also checked the junction box outside and also the physical telephone cable. Replaced the infinity filtered telephone socket and the hub and OpenReach Modem. All in all I'm glad he was thorough. He even requested that BT Wholesale perform a complete reset of my line as well