I have just moved and tinternet and BT line were I thought.
Now if anyone rings in, I get one ring and then on lifting phone to
ear, I hear nothing. It is disconnected.

I have played with the filters and have got to the point where if I
have both intenet and bt line in the splitter, I lose the phone and
vice versa.
If I run them one at a time from the splitter there is no problem.

Any pointers please ?

Mike P