Yes - I'm glad to say this DoS attack didn't impact on me.
From the status log it looks as if "Mostly broadband traffic not impacted - but services in Maidenhead are being hit, including VoIP and web servers."
and "Overall traffic for broadband customers does not seem to be that impacted"
The status post was from the 23rd, as you correctly say, it was giving advance notice on the planned downtime by BT in the wee small hours of the 29th. I note there is another planned for 19th April.
I appreciate A&A being so open & keeping us informed.