We had NTL Digital Plus installed in 2000. The interactive option was slow, bulky and liked to crash. Trying to use the remote control to type things was painfully slow. The best thing about it was TwoWay TV, that had some good games on it, as it was Cable you didn’t need an additional connection to the internet.
After a massive software update (I think it was called Liberate 1.2), the interactivity power was increased. This meant that things like play along Fifteen To One arrived on Channel 4, which was fairly decent.