RosemaryR wrote:
Does anyone know how the pumpkins come into, it or is that an American variation?
Hi Rosemary welcome to the forum, 
originally in Ireland and Scotland the pumpkin would have been a turnip or potato or cabbage (Scotland only), whereas, in England they were carved from beets. The "jack-o'-lantern" emerged from the Irish folktale of "stingy jack", like all folktales it has many regional variations:
From wikipedia, scroll down to tradition and folklore:
http://en.wikipedia.org/wiki/Jack-o'-lanternAnd from the History Chanel: 
http://www.history.com/topics/jack-olantern-historyThe tale and tradition was brought to America, by Irish, Scottish and English emigrants, and there it was reinvented, like much of the other stuff associated with Hollowe'en. Its much easier to carve a pumpkin than it is a turnip or potato. .
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 (Amhlaoibh Ó Súilleabháin)
Please wait for corrections/ more input from other forum members before acting on advice
I'm familiar with Munster Irish/ Gaolainn na Mumhan (GM) and the Official Standard/an Caighdeán Oifigiúil (CO)