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Thanks mushroom25, I thought I caught that on the news this morning ...
No mention of it on the Heathrow site or the Highways Agency site - it seems they only report when there are problems, not when problems have been cleared up. And the BBC site is down - they are really struggling this week.
On C4 news last night they were saying that they didn't know when it would be all sorted, and it could be Monday, so I thought it was time to start making plans. I suppose it's typical of the shambles that, less than 12 hours after that statement, it was open again. Let's hope it stays open!
Thanks to all for their help.