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1. How relevant is WordTracker for UK?
2. Is there an alternative? (I know about UK GoTo)
I'm afreaid that WT is fairly U.S. centric, primarily due to the data sources they use. While you may be able to get good data for the specific terms you mentioned, WT might vary well miss the endless numbers of linguistic variations that exist simply due to the fact that a very small amount of the UK population use Dogpile and Metacrawler to search for information.
I've heard that they are working on deals that would allow you to search data from regional engines, but I don't have any details. I would suggest that you send them an email asking them about their future plans regarding the U.K. I would think it would be a fairly high priority since they themselves are a U.K. based company.
I would really like to know any more opinions/understanding on how relevant WordTracker is for the UK for terms that are equally UK and US
(e.g. not: sneakers, cup-cakes, gas, etc).
Lets take 'homeopathic remedies' for example
Would anyone like to hazard a guess at the % that UK might represent in WordTracker results.
You might want to try and contact InfoSpace U.K. [infospace.com] and ask them about keyword based advertising on InfoSpace sites. They might very well be able to provide you with search counts by geographical regions. Comparing those numbers to WT counts would not only give you an idea of the percentage of U.K. users that contribute to the database, it would also allow you to see if there are any significant differences in search behavior.