Re Belgium vs UK - they count all suspected Covid deaths, including in hospitals/care homes/own homes, and not just those who test +ve; we only count those who tested positive, and have not yet fully allowed for deaths outside of hospitals. We are ahead of them, I suspect.

As to high risk events for spreading - think skiing - so many times in the whole experience when you are inches away from others, much less metres: the airport/plane/bus/accommodation/meals/lift queues/cable cars/apres ski and so on - and it is for a large part of the day for six days or more. Petri dishing.