You need to change your ISP to one of the smaller ones, which will not just mean that your connection is unfiltered but also mean you're using (and supporting) diversity and increased competition.
You can get a good idea of the company's general philosophy from their owner's blog: http://revk.www.me.uk/
Unfortunately they are quite expensive compared to the bigger ISPs but in their case you really do get what you pay for.
I used A&A before I moved to Ireland and really miss them. I'm stuck with Eircom (there is virtually no land-based provider choice in Ireland if you live outside of Dublin) who are a financial basket case and suffering from virtually no infrastructure investment outside of Dublin.
Internet access in Ireland is like the UK was back in 2002/3 and the Irish government wastes millions of euros on half baked 3G/Wireless schemes that don't work instead of fixing the terrestrial system properly.