As a Brit, I will confirm Lyle's interpretation.
Cockney rhyming slang can get really difficult when only the first word of the rhyme is used.
plates = plates of meat = feet.
When you get into a slang derivative of the rhyme like "seppo" it's really tricky 
I don't think Seppo is meant to be really insulting. Just mildly.
Last edited by Tony; 25th February 10 at 09:45 AM.
Reason: spot of bovver with a typo
Daft Wullie, ye do hae the brains o’ a beetle, an’ I’ll fight any scunner who says different!