Wait, if the UK, which doesn't suffer from these problems quite as badly, still has lower GDP growth than a country that does, that says something bad about UK's growth. So it seems clear then that the UK has done something badly wrong.
> GDP growth is far from a good economic indicator
It should be good enough. For one thing, large systematic movements in any indicator can be used to measure things, and the indicator doesn't have to be totally precise for it to be useful.