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@jcaron yeah, it's unclear. But in the end, this whole hack story is IMO irrelevant to the question which should have been: Can I trust any hotel (or booking.com) with my personal information? Regardless of a (un)known hack.
The exact rules differ by country, and seem to be more related to the type of knife than it's size, e.g. no double-edged knives etc. Between Spain, France and Italy, France looks the most strict, with a blade limit of 3". Also, in all three, you need to have a proper reason to carry a knife, in Spain, you can't display it in public places, etc etc. In short, there isn't a single answer. It's probably best to Google "knife law (country)" for all countries you'll be visiting
What kind of answer are you looking for? I'd recommend to just call them and ask for an explanation, if 3.66 is worth it for you. Apparently they managed to squeeze in another 2 litres of fuel (or maybe less, where '1' is their minimum amount), so perhaps you didn't quite fill the tank. But of course there's no way to prove that either way.
Strange, until March 14, the ferry departs at 10.30 which seems to align better with the train. I wonder if train times will change then, too. Maybe you should contact Arriva about that. The Arriva travel planner won't let you select a date after 13-02
It may depend what you are after exactly. For instance, when going on a dog sledding tour or other guided outdoor activity, you can sometimes borrow warm clothes from the organizing company. kirunalapland.se/en/plan-your-trip/clothing-arctic-adventure
Yeah, unless you have two cards. BTW, children between 4 and 11 can use a so-called Railrunner ticket, which is only € 2.50 per day. Children under 4 travel for free.