I agree, the UK music scene was just nearly everything in-house and Brit Pop came from it and it wasn't until The Strokes where international stuff started to make a big impact again from the underground/independent stage and up and even then the UK indie scene thrived into the mid to late noughties. I think the only thing that wasn't UK based that was from the US and dominating was RnB and Hip Hop, UK rap just wasn't taken seriously at all til the noughties despite great rappers like Rodney P and guys like that except for maybe Roots Manuva. It took for it to be repackaged as Grime through the garage scene to really start making a mark.
I never thought about it in those terms actually. The music scene in the UK was incredible during the nineties but it was so good it blocked nearly everything else out like a big dust cloud. Barely anything got through unless it was super big artists or you really went looking for it and even then lots of US bands and artists just weren't in the game compared to what was coming out in UK at that time.
Good old MDMA changed up that game completely, it was a pretty amazing time music wise.