I run a startup, and I am looking for how much medium sized companies, and up to multinational companies, spend on hotels each year in the UK & Europe.
Google is the best way to search for anything, however you need to know how to use it properly. If you have the right set of tools and you know how to use the search filters, then you can became master of it.
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You can get in touch with hotel associations, they may have some of this data. You can also call, some of the companies and just ask. You might also want to check if companies like american express will divulge some of this information. Lastly, google away, try a million different way of rephrasing what you are searching for also.
Reach out to me so I can get more context and see how I can further help you.