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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The Tory peer and former Marks & Spencer chief has been named as chairman of the 'In Campaign'.
Delicately worded memo by then press chief from 1985 is among cache of newly released documents from former PM's private files.
Cloud and showery rain may linger across the far northwest throughout Saturday.