France is good for tomatoes too. I think it's definitely partly about local availability. But probably also a bit to do with cultural consumer choices too. France/Italy/Greece all have big food cultures in a way that isn't quite matched by northern European countries.
That said, it seems to be getting easier to get high quality vegetables (including tomatoes) here in the UK. It's not from a supermarket and you pay more, but it is available (maybe still not quite as good as other countries, but certainly much improved on the flavourless stuff).
In France, standard supermarket tomatoes are standard bad - but we see increasing availability of different species obviously taking genes from heirloom varieties... They taste great and consumers are beginning to understand that weird shapes and colours mean flavour.
That said, it seems to be getting easier to get high quality vegetables (including tomatoes) here in the UK. It's not from a supermarket and you pay more, but it is available (maybe still not quite as good as other countries, but certainly much improved on the flavourless stuff).