Any series which predicts a future society will inevitably get things wrong. Margaret Thatcher is revealed as still in power in1999, even though she was no longer Prime Minster after 1990, and Prince Charles is revealed to be the king. However, as a satirical comedy programme, such things are not to be regarded too seriously, and were intended for an audience of 1989, not the time period in which the programme is set.
The fashions used throughout the series are notably of their time, in particular the very large glasses worn by a newsreader, which were fashionable in the 1980s, but not in 1999.