Many thanks for the reply. I didn't realise the resetting procedure was as simple as turning off and on before! It does seem as though my inferior phone line is causing the trouble though so unfortunately it looks as though the only way I'll achieve a faster connection is to move house! Am I right in thinking that Infinity (if it ever comes to my area) won't improve the situation as I'll still ultimately be relying on my phone line.
I will try and get BT to at least look at the line if the resetting after the initial 10 day period doesn't improve things, Thanks again.