Did you miss the .co.uk off that URL?
How is he sending out that hundred emails? Not manually I hope? You get some very good mailing list software or services that will bulk send to your subscribers. I would look into that.
I'm not a huge RSS fan, for example I don't have an RSS reader on my PC or Windows Mobile phone. There are no feeds set up in Outlook, or Opera either.
I really dont see the point in getting too complicated for that kind of business. I wouldn't have thought his customer base would really care. It's not Engadget of Slashdot he's running with perhaps a couple of dozen updates in a day. And his readers aren't going to be 14 - 30 (ish) tech heads.