hi Des, if you read/speak a bit of German or French, suggest you make first look at trade groups links
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www.gastrosuisse.ch for industry stats, etc.
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www.gastroconsult.ch for advisory (more financial and admin, but have in-house marketing and research guys for larger projects) If you call you'll likely find someone who speaks English.
If you have small project or focus in specific town/Kanton, probably better to go with local knowledgeable person - if wine or bar related, likely at distributor or wholesaler level. PM if you have specific needs, maybe I can give suggestion or two.
Good luck!