725,Sorry for the delay in replying."Well chuffed" just means very pleased. No idea where it comes from but it's just one of the odd phrases that people use. There are others which are much more odd. Some can be traced back to old Cockney rhyming slang but not all of them. "Well" in this sense means "very" . A "well hard bloke" would mean a tough guy. "well knackered" , very tired. They go on and on.

Smellysniper