What does the DSL checker say for your line? www.dslchecker.bt.com
Use the full address if you haven't got a phone number for it, not the postcode checker.
Try the neighbouring lines too if there are any.
Use the Ginp Formula to determine if your vdsl2 connection is with or without G.INP.
Divide your IP Profile by your Sync Speed and the answer is 0.9669 (with) or 0.9679 (without)