Id say so if you are visiting that country.. Even when I went off to Thailand I spent a good month learning casual conversation so that I could get by, turns out most of the people I met spoke very good English :cry:
Travelling around Europe by train you'd have to know an awful lot of languages to communicate with locals in their native tongues. In fact, you don't even have to cross borders to change languages - Switzerland alone has four official languages and Belgium has three. This is why people from say, Estonia might talk to people from Spain in English, because it's a common language they both have some knowledge of.
Personally, I can speak German well, plus I can just about get by in French (invaluable) and Dutch (of little value). I can understand more Spanish than I can speak it.
I normally learn 'hello/thank you/excuse me' in every country I visit - I can't become conversant in Danish/Swedish/Finnish/Czech/Polish quickly (those are the countries I've visited/passed through in the last year or so).
For example, I was on the Berlin to Vienna train earlier in the year, which actually passes through the Czech Republic. The on-train staff can't expect the passengers travelling between Germany and Austria to speak any Czech, can they?
Hence why I do my very best to listen when I encounter foreign people in this country who are really trying to speak English but are struggling and those that dont even try do not really get my full attention.
We are as a nation quite used to people not from here speaking English though. You might feel different as a member of staff in somewhere like Denmark, where very few foreign non-residents have a decent enough command of the language to hold a conversation. That's opposed to here where a lot of foreigners from non English speaking countries can speak enough English to get by, because it's a popular language to learn worldwide.
However, if someone who genuinely doesn't speak English learns a few basic words, I suppose any helpful member of the public/staff in the UK would try and assist them. At least I'd hope so.