Because I was ordering a replacement item as previous window blind (15 years old) the website made it easy once I found the code! However whet it failed to tell me was that the replacement would have a different/updated code.... so I thought initially I had recieved the wrong item! The replacement also had different fittings and operates differently which isnt neccesarily an issue as long as I remember to inform any guests (blinds are in guest room). The blind does fit and operates perfectly...
