Thanks all - I will sit and wait for the 'BRA' to settle down, perhaps.
Not too sure about the ISP 'deploying' network hardware
a) My provider IS part of the talk-talk net. Balanced reasons for not shifting at present.
b) Broadband here in darkest Sussex is 'bundled' and strictly BT
There are possible signs of a 'settling down' as the down stream has dropped back a little this am, but still up on previous. I'll try changing the DNS address.