So... I have checked a few other friends lines where they are connected to ECI cabs, all have G.imp turned on.
My downstream INP has now gone down to 42. Seems odd that it's now active on ECI cabs in the dying days of VDSL broadband
No INP applied to upstream... yet. (I doubt it will be)
Packet loss has improved but not gone. For a day after each resync I had almost no packet loss!, then it came back...