I popped this on the forum but havent had any replies, I was hopping my buddies might be able to help.  I thought I knew how todo this, but I'm in an extremely competitive market so doing the usual searchesisn't enough. Normally I type in the keyword/s into the box and work from thereand its usually a US search. But the long tailed keywords are coming up withsearches of often 50,000-150,000+ Please can someone clarify the following
I am searching within the Advanced options -Locations:United KingdomLanguages:English

It says that the Global search "Theapproximate 12-month average of user queries for the keyword on Google.co.uk and theGoogle Search Network. This data is specific to your Keyword Match Typeselection"
Then
"If you specified a country or language foryour search, this is the approximate 12-month average number of user queriesfor the keyword for those countries and languages. It isspecific to your Keyword Match Type selection."

So if I am searching in google.co.uk and thecountry is UK why are the global and local searches different? I couldunderstand it if i were searching the US from the UK, but the two locations arethe same, or are they not?
Also-
I then go onto google chrome, which takes me togoogle.com. Should I stick with this or go to Google.co.uk which reduces thesearch or isnt this an accurate result?
Then if you put in the pages from the UK (whilston google.co.uk) the result is further reduced.  

Which is the best result to take as a guide tocompetative here please?  Asnormally I only have to put the search in quotes to get a good result this timethey are way too high to use. Am I getting a low score by doing this that wonttransfer to traffic?