It's normal procedure for ISPs to use throttling on high bandwidth applications like torrents to ensure quality of service for all users. This usually only applies during peak usage hours and has nothing to do with sensorship. As far as I am aware it is not currently UPC policy to block
any websites as their stance is that it is not their business to control what users can and can't access, they just provide the service.
This might change though because IRMA have turned their sights on them following the Eircom settlement (3 strikes rule).
On the original topic, UPC are planning to introduce 50 megabit broadband across their fibre network in August with 120 megabit to follow soon afterwards. The plan, I believe, is to have Ireland in line with their
Netherlands operation by the end of the year. They'll have spent €300 million upgrading the network between 2007 and 2011. As somebody who has used cable since ntl first introduced it nearly a decade ago, I have had service that consistently matched the advertised speed (starting at 512k, going to 600k, 1meg, 3meg, 6meg and then 10meg as they continued to upgrade the network), so bring it on I say!