Hi all

OK so I went round to mother's last night armed with my own cordless phone
(Siemens).

The findings seemed inconsistent and were as follows:

Plugging our phone in showed similar levels of crackle-hiss noise as
mother's.
Unplugging the upstairs phone and filter seemed to massively reduce the
noise.
There was still some noise present when plugged direct into the master box
rear connection (with filter included).
I tried turning off fridge/freezer and heating to check that this was not
the issue.

One very strange anomaly noted....

With everything plugged in: twin cordless phone and wireless modem into
front connection of masterbox via splitter downstairs - and - corded phone
via filter upstairs: When a call is made from the upstairs corded phone,
the modem dropped its connection - then reconnected when the call was
terminated.

Does this indicate a dodgy splitter? At first I thought maybe I was just
unlucky and had 2 dodgy splitters. But then ISTR that they tried a cordless
phone before they had broadband and gave up because of the interference.

Thanks to all

Phil