Online booking agent lastminute.com completed the upgrade of its Web site on Monday - only for the site to go down for nearly an hour.
The technical glitch, which was unrelated to the launch, saw the site which specialises in last-minute deals, go down at about 10.30am for about 45 minutes.
Chief executive Brent Hoberman blamed the problem on a contractor developing online security for a South African venture and said he would seek compensation for loss of business.
The upgraded site, completed more than four months behind schedule, is based on a three-tier technology platform using Unix, Java and XML.
The architecture is built on the open standards-based ATG Dynamo application server. This allows lastminute. com to focus more specifically on individual users, enabling it to promote more targeted offers. Customers can also design their own lastminute.com home page through its MySpace service.
Hoberman said the upgrade should help lastminute.com increase the percentage of users who transact on the site.