I have bought bb clothes in Mothercare last week and the sales informed that the HSBC promotion will continue throughout Nov.
If you don't have HSBC card, their bb clothes products still have discount if you buy 2 items or more. But I don't know how long will this promotion last.
Today Mothercare at Grand Century Place (Mongkok) still have "fashion (clothes/sleeping wear) promotion" - 10% discount for purchase of 2 fashion items, 15% discount for 3 fashion items and 20% discount for 4 fashion items.