As far as I can tell, Heather is still able to register for British citizenship, it might be a good idea to do it anyway just in case they decide to change the rules at some point, free access to the EU will always be handy.
If that Wikipedia article is correct, which of course they sometimes aren't, Heather doesn't have to register anything: she is considered a citizen by Britain, unless she's specifically written to the British Home Secretary asking not to be.
Congratulations, Heather, you're a Brit. Have a cup of tea!
Peter
My nephew was born under those same circumstances and I was told he has dual citizenship. Of course his mom is a bit looney so I never took anything she had to say seriously.
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