No experience of diesel cookers myself but they seem to be favoured by some of the inland waterways/narrowboat fraternity. Advertiser in Canal boat mags is Kuranda Marine whose web site is at http://www.kurandamarine.co.uk. New site and no real info yet but their phone number is there.
I remember the one time I sailed on a Coaster with a diesel fired range .... it had a drip feed via a glass sight glass to the burners. The food always tasted of diesel !!!!!