@Eva,
YUCK, greenhouse grown tomatoes, thats sorta like "corinthian Leather",totally fake.
The best tomatoes need just a little bit of pain and suffering from just enough, but never too much, rain and ample heat.
A summer tomato rewards you with flavors so complex that youd need a spreadsheet to itemize em.
And right osso, a really great tomato needs no salt. But it must be slightly warm from the day's sun.
UK is at the same latitude as Labrador, so its understandeable why they need greenhouses to start the season. Yet they make up for it by their days length in summer.