My wife bought shoes from JustFab 2 months ago, and we know found out that they keep charging us each month. According to their customers support we need to enter they website each month at the beginning of the month and ask them not to charge. We didn't do any subscription. Be carefull!
Do not buy from this company!
And if you did in the past check carefully your bank account. It is their business model. They just try. Most of the customers won't notice 30 pounds debit.