Lord McAlpine, who announced he was dropping defamation claims against Twitter users with less than 500 followers, said he wanted to draw the "unfortunate episode" to a close.
He has written to those tweeters and asked them to make a voluntary donation of £25 to the BBC's Children In Need as soon as possible.
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A grey start to the weekend with patchy rain for Scotland and eastern England.
A 31-year-old, stabbed nine times when he asked a man to stop harassing his girlfriend, has raised more than $28,000 for hospital treatment.
The Prince has called for "zero tolerance" on the ivory trade, which he says is increasing "alarmingly".