More snow means that Christmas gifts bought online after today are unlikely to be delivered on time, online retailers have warned.
Some have begun cancelling Christmas orders because couriers cannot deliver goods.
The news comes as huge areas of Britain are hit with fresh snowfall and severe ice on the roads, with forecasters promising there is more to come.
Smyths Toys has already cancelled hundreds of orders for toys and gifts as a huge backlog of undelivered orders totalling more than four million items, has built up at private courier firms over the past two weeks.
Spokesman, Jamie Darby said: "It is with great regret that we have found it necessary to cancel a number of orders – in their hundreds – because it would have been impossible to get them to customers".
Many other online shopping companies say they will not be able to make deliveries in Scotland and the North-East, which have been badly affected by the snow.
Meanwhile, stores including Amazon, Boots, Carphone Warehouse, Jessops and Best buy have brought their Christmas delivery order deadlines forward.
The deadline for Amazon first class post delivery is midnight on December 18th. But it has assured that some orders can be taken up to 2pm on December 23rd for delivery on Christmas Eve.