P.S. I thought they were a very poor company to work for. There was a lot of variation in how different stores/departments were run. Some were the height of cushiness before the cuts, others were hell on earth, particularly at demanding weekend shifts with 1 member of staff to cover 50,000 square feet. People who worked in the small/medium stores were generally happier than the big stores that often had a lot of problems.
There was about 20% of the company who had a religious view they were excellent to work for. You always had to be careful what you said around them.
I think they'll probably keep you on after your probation. But challenge everything if they try and let you go. Get a half decent union person or colleague to go in with you.