Apologies if this thread has already been discussed.
Having read lots of threads on BF I am planning to buy the EF 100 - 400 IS to go with a 40D (my mind is made up, I don't want to start this discussion off again!!! 
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However, if I get an import this works out at £200 cheaper, I can still get cashback and would come with a 1 year international warranty. How does this compare with getting a lens from a UK retailer? Are there any potential implications with quality that I should be aware of or other problems I may experience?
I don't think that there are any quality issues, however make sure that the lenses comes with the proper Canon warranty, some of the importers offer other warranties that are not as good.
This is a bit of a grey area if its imported from the USA then it generally comes with a warranty that is covered by Canon UK.Anywhere else outside the EU and you would have to return to where you got it from.Hong Kong and most dealer on ebay wont be covered by Canon UK