During 12 years I had numerous longer tech training periods for 1-3 months at a time in London, Paris, Zürich, Manchester NH and Wilmington MA. This is the order my memories run from positive down. I do not blame any other than myself, but to my experience there is a wide gap in general between these two continents. Habits and attitudes are different and the one that adjusts easily will have least difficulties.
In Wilmington MA I was the only one attending training outside US and it was heartwarming to hear people from California constantly referring to the East Coast with names. I never forget that I was remainded that it was not proper to eat ice cream before 10 am (they had a vending machine for it). They made remarks for me dressing casually during training and wearing my suit at evenings as they behaved just vice versa. Fortunately we were downstairs as I was told that in the office they had limited the number of pens one carry in shirt pocket. Also set temperature limit for men wearing short sleeves. Some of them could not understand me having a steak instead toast and maple syrup at breakfast etc.
These experiences did not depress me understanding that I was the odd one out, square, whatever. It is very much up to one's own personal attitude. Why anybody would travel on ones own expense and free will without first learning about the destination. If travel goes with your emplyment you eventually get used to these differencies.
"Proper preparation & planning prevents piss poor performance." - Awul Dasfilshabeda and Nowaynayda Zheet