Openreach came to day to test my line after a GEA test by plusnet has found a fault but according to openreach there is no fault.
GEA Test Detail Circuit ID NA Service ID BBEU27062726
Test Outcome Fail Test Outcome Code GTC_FTTC_SERVICE_1625 Description Impairment in copper joint detected most likely in local network. Please continue to submit a trouble report Main Fault Location LN Sync Status In Sync Downstream Speed 28.2 Mbps Upstream Speed 3.5 Mbps Appointment Required N Fault Report Advised Y NTE Power Status PowerOn Voice Line Test Result Pass Bridge Tap Not Detected Repetitive Electrical Impulse Noise Not Detected Estimated Line Length In Metres 1308.5 Upstream Rate Assessment Reasonable Downstream Rate Assessment Very Good Interference Pattern Regular Interference Observed Daily Service Impact No Impact Observed Interference Duration Longest Occurrence From 14:30 to 00:45 Interference Location Customer Premise Home Wiring Problem Not Detected Downstream Policing Discard Rate 0.0 Customer Traffic Level Upstream and Downstream Traffic Detected Technology VDSL Profile Name 0.128M-40M Downstream 3dB, Retransmission High - 0.128M-10M Upstream, Error Protection Off Time Stamp 2018-01-13T14:30:00
So why are you sure that there is still a fault? The GEA test is over 2 weeks old. The speed it reports looks about right for your distance from the cabinet and the radius graph you have attached shows no drops for 3 days.
So what is the problem you require investigating? If there is a copper joint impairment you may need to wait for it to devlop into a detectable fault.