"Wick" (as in "Gets on my wick") - Hampton Wick : Prick

This one's a bit puzzling. Why isn't the expression "Gets on my Hampton" then?

I've certainly heard "Hampton" used for "prick", and the usual procedure with rhyming slang is to drop the part that actually rhymes, e.g. china = china plate = mate. Why is this expression different?

[I remember there was a song by the "Carry-On..." team (from the British series of vulgar comedy movies) called "The Day King Henry Got His Hampton Court", which was a play on the rhyming slang meaning of "Hampton"]