LONDON — London Olympics organizers have put limited numbers of tickets for the 2012 Games on sale in Britain.

The tickets are being sold at face value and come from customers who decided to submit them for resale.

London's organizers have struggled over the subject of tickets. They set up a complicated lottery system in which people blindly registered for tickets and handed over credit card details before learning what tickets they were getting.

Two-thirds of ticket seekers failed to earn any in a first round that ended in April, with 22 million requests for 6.6 million available tickets.

Another round was blighted by computer problems, and Twitter was alight Friday with complaints from other ticket seekers having problems with the website.