People who wish to sell unwanted tickets can use an official exchange system.

There will be a further opportunity to resell any unwanted tickets from spring 2012.

The process for people to resell unwanted tickets opens on Friday.

Games organiser Locog said the section allowing unwanted tickets to be sold at face value was still being fixed.

The player must keep at least two of these destination cards and discard unwanted tickets to the bottom of the stack, if any.

The resale site allows the public to sell any unwanted tickets at face value.

Those with unwanted tickets will now have until 6pm on 3 February to sell them back to Locog.

Customers who offload their unwanted tickets on the exchange will receive payment in five to 10 working days.

The more serious problem was a failure in the "back end" of the system that prevented users from uploading their unwanted tickets.

Locog will buy back unwanted tickets at face value but public will not be able to buy them until later.