Diary Crest closes in Whitland with the loss of about 30 jobs
31 January 2014 Last updated at 08:54 GMT
The Dairy Crest site at Whitland, Carmarthenshire, closes on Friday with the loss of around 30 jobs.
Two years ago it was reopened by the Proper Welsh company so that Welsh milk could be processed and bottled in Wales.
Dairy Crest stepped in last year.
There is now only one dairy left in Wales.
Economics correspondent Sarah Dickins reports.