Cambridgeshire area, and my accent is very slight. Mild bit of a brogue, but I'm an English teacher so I've excellent oration skills.
Laaaadies.
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The flights are longer now though because of throttling, takes slightly over an hour in the air now.
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Not really, Ireland and Britain are less similar than US and Canada if that's what you're thinking.
Different heritage entirely, one being Celtic, the other being Anglo-Saxon/Norman for the most part.
Not to say there'll be major culture shock, I've travelled a fair bit so I'm not even remotely worried about it.