Dark cable from master goes along side of house and reenters the house at a BT labelled cover, the other socket uses a light grey cable.
So there are some joins under there am I allowed to have a look?
If you had a poor connection, you would hear a crackle on the line. Also, line would tend to drop if you picked up phone.
On that basis, assuming your filter and hub are OK, I'd suggest line fault.
No crackles
I have a spre home hub - if the line comes back clear I will try that - and spend ages reconfiguring everything
for testing, no real config - as you are central plus, just plug it in 
Will get from loft later
I actually wanted the hub phone - but they sent me another hub instead
I need to get my hands on a hub to do some further testing - had to give the last one back 
Wondering if it uses the standard Thomson firmware, and if so, if it can deal with multiple subnets.
Unfortunately not as BT use their own crippled firmware. Can't even telnet in. Several preconfigured subnets are locked into firmware for use by BT proprietary services. Early hubs can be reflashed with thomson stuff, but recent ones are a bugger.
