Only one ever had g.inp. 2nd line was enabled on the 19th March.
The line with G.INP has BT TV, at this point I'm thinking G.INP was rolled out early for people with BT TV and they don't plan on turning it off at the moment.
Note that my 2nd line is Plusnet and wasn't activated until G.INP was halted, hence it never had G.INP.
So unfortunately we can't be certain that it's because of TV services unless someone without TV services has had G.INP disabled on Cabinet 19 Hemsworth.