You're with crappy tiscali? I had their dial up for a while with web accelerator while i was waiting for them to remove THEIR marker off my adsl line.. lies after lies and OFCOM being involved.. after 2 months I was back on broadband (ADSL) with another isp. Fot the extra few quid get yourself adsl.
I'm on 1mb now, had 576kb adsl for 5 yrs.. to be honest, unless you're downloading a lot, 576kb is fast enough, and cheaper. I'm with naims now.. check their broadband prices at
http://www.naims.co.uk