It is quite easy to grow an avocado tree from the fruit purchased in your local supermarket but, keeping it alive in the UK will require some effort.
Banana plants grow exceptionally well in the UK during the summer months but, they need to be protected from frost over winter, to avoid them dying back to ground level.
I have had a lemon tree for several years now, which currently provides about 5 lemons each year.
I have had a lime tree for several years now, which currently provides 20+ fresh limes each year.
More on growing a mango from seed.
I have a small orange tree with decorative oranges but, they can be used in cocktails.