I did try to look for other wholesale sources for Atmosphere clothing and found this important information. I have learned from forums that you won't find suppliers selling Primark-Atmosphere stuff as most of the clothes they sell are custom made/labelled for sale ONLY in Primark stores. And with this I am providing you a link to Primark UK. - Link hidden: Login to view
Hope this helps. Let me know should you need more help.
Have a nice day!