Hi Andy,
Your switch sounds just the job to get over my quandary. However things have moved on a bit this end. Having just now found on this site ( I am new to it) the manycondemnatory reviews of Orange Broadband, and the almost 100% fulsome praise for Direct Save Telecom (admittedly only 6 reviews - perhaps not many have heard of it?) I am now seriously minded to go for their Option 4 package, subject to a couple of assurances re single phone, no dialling tricks etc.
They sound so good I wonder where the catch is!?
John.