Yes Tiscali is known to be a filterer of p2p in some locations (they are a large company over Europe.) As soon as they detect you using p2p they'll apply the filters. See the report here: ISP's known to BLOCK or Filter p2p or specifically Limewire I've personally read articles about them doing this.

Edit: I just did a quick google & at the bottom of the following link is reference to Tiscali: http://www.edri.org/issues/freedom/jurisprudence though this is not exactly the same as it doesn't refer to them filtering.