Tks for reply but I now see just the item I'm after; has arrived this side of pond http://www.kiddefyrnetics.co.uk/RechargeableCOAlarms.shtml
I see on this US site
Try looking here:
Mogweed Nov 18, 12:09 pm show options
Date: Fri, 18 Nov 2005 17:09:03 +0000 (UTC) Local: Fri, Nov 18 2005 12:09 pm Subject: Re: Interlinking hard wired smoke & CO alarms Reply | Reply to Author | Forward | Print | Individual Message | Show original | Report Abuse
Doh! Just realized that these are battery only. The Kidde website (http://www.kiddefyrnetics.co.uk /) makes no mention of mains, interconnectable, combination smoke/CO alarms so I guess they don't do them for this country.