OK, so Standard Industrial Classification (SIC) of Economic Activities codes... looking into this:
2003 codes are for hazardous waste (as some paperwork has required this from 2005 and they don't want to disrupt existing audit trails)
2007 codes are the most up to date ones to use for other waste - like veg oil.
The Office for National Statistics sets these codes:
http://www.ons.gov.uk/ons/guide-method/classifications/current-standard-classifications/standard-industrial-classification/index.htmlSee "Index, Alphabetical and Numerical (1.6 Mb Pdf)"
The document gives 2007 and 2003 codes but we should be using 2007:
56101 is "Restaurant (licenced)"
56102 is "Restaurant (unlicenced)"
These are for full service restaurant - however there are codes for self service restaurants (IE McDonalds style) as well as hotels and burger vans too, obviously these codes need to be changed as appropriate for whoever you are collecting from.
So I've made some changes to the WTN, will upload it when I'm happy with those (after lunch?)