Gap has stood out as one of the few high-street chains not to have an online store.
Gavin Ailes, deputy managing director of agency The Search Works, said: 'People are realising ecommerce is necessary and are having to play catch-up.'
Elsewhere, Google's industry leader for retail, Peter Fitzgerald, said many retailers were unable to deal with the high levels of online demand over Christmas. 'They have to take investment in online platforms a little more seriously.'