Proper name is Dianthus caryophyllus - commonly known as the Clove Carnation. Not sure about the variety Merlin Clove, appears to exist but you may need to buy it on the internet if you can find it.

According to the RHS Plant Finder website no-one listed with them is selling it currently. It's down as last listed in 2005.
http://apps.rhs.org.uk/rhsplantfinder/plantfinder2.asp?crit=merlin+and+clove&Genus=Dianthus
Looking for it is complicated by the existence of "Dianthus Place" and "Merlin Clove" as street names in a place called Winkfield Row near Bracknell. lol!