Jimmy averages 40+ in SL, and is only half the bowler he is in England.
I live in a coastal place with a high humidity year round - and often see local club bowlers swing prodigiously here, albeit at lesser pace.
But then why are English conditions considered more difficult to bat on, against pace bowlers? Is it the extra bounce? If you can swing wherever there is humidity, then many wickets in India and SL will be paradise for pace bowlers, because of the high humidity of the tropics.