Hermie,
Your question about ATIS being updated: I don't fly from ATC fields very often in the UK, but this is how it worked when I was the in US - I assume it would be similar over here.
Whenever the ATIS is updated, ATC will "general broadcast" the new ATIS letter, runway, wind, and anything else important.
Occasionally, the ATIS will be updated between you listening to it, and making initial contact. In that case, the conversation would go:
"G-ABCD, <all the other initial contact information> with information Delta"
"G-CD, information Echo is now current, wind is xxx@yy, runway zz is in use......"
So, either way, no problem, you'll get all the information you need.
FFF
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