"...the PC crew prefer to call them 'Travellers'."
I call a spade a spade. They were Gypsies before PC became the buzz-word, and they will be Gypsies until hell freezes over.
Just like I say, "MERRY CHRISTMAS!" instead of "Happy Holidays."
The Gypsies, though similar, are a different group, in fact an ethnic group in themselves - the Tinkers are indigenously Irish, and despite claims to the contrary, are not ethically different from other Irish.
BTW, the PC crew now refer to the Gypsies as 'Romany' - something to do with the fact they are of Romanian origin.
Here in America, we have gypsies and travellers. Travellers are almost exclusively of irish extraction; gypsies are of central european descent.