If I received some unexpected amazing news then first I’d check it was actually definitely true. Then I’d tell my Mum.
After that depending upon what the exiting news was, I’d probably celebrate in the typical British way – with a cuppa, while I digested the news and decided what to do next.
If it was news of a new family member being due, then I’d keep quiet until the parents announced it officially.
If it was a big win on the lottery, I’d be straight on to http://www.rightmove.co.uk and booking viewings to see some possible properties.