Do all lenses have International Warranty?

I'm sure this has been answered before, but searching through the forums I can't find a definitive answer anywhere.

I live in London (rip-off Britain) and I'm going to Hong Kong later in a month. Can I buy a lens there and get it serviced/replaced/what​ever by a UK Canon dealer?

I've just been looking at one of my lenses which is a grey import from the US, and it has an international warranty card that isn't stamped (I guess because it was bought wholesale and re-sold).
Also, am I right in thinking that the warranty is only applicable to the person that bought it from the Canon dealer? If I re-sell a lens on eBay or whatever, can the warranty be transferred?

Advice from people who've done this would be much appreciated.

Stephen

Some do some don't,if you buy from hong kong the chances are no.If you buy from Kerso on here you will be ok.

I don't know if this is correct because customer service representatives can be wrong. However, when registering my camera on the phone with Canon, I asked about the lenses that B&H sells that are listed as "imported" (usually $10 cheaper). She told me that Canon camera bodies are regional; i.e., because I live in the U.S., I need to purchase a U.S. body to ensure coverage. On the other hand she said that all canon lenses are covered by an international warranty as long as they are original canon equipment.