Was instore at Debenhams earlier and saw this advertised. Spent £25 on H by Henry Holland and receive a free £15 itunes card.
Valid from 24th-27th November instore.
T&C's stated that clothing item could be exchanged later, but if you wanted a refund the cost of the itunes voucher would be deducted first. Therefore only really of use if you can use either as presents or you intended on buying somethere from there anyway.
I had a look around there were accessories that you could combine to a £25 level, some tshirts less than £25 and one brown bag at £25 which would all work for the offer if you didn't want to spend more than neccessary.