I would speculate that not much survived in that area of the world, from that era. Take into consideration the size of the UK, a much smaller land base, smaller population. I wasn't around at that time, nor am i from there, and i don't know the level of interested in computing during that time frame. Could also be that the people in UK at the time, didn't really keep anything after it was used, as a result of that, not much survived to see the 2000's either. So many reasons, those are what i would say with some level of certainly, but not completeness.