Tesco has seen its website crash as customers attempted to book festive delivery slots.

Customers were able to book their Delivery Saver Christmas slots from 6am yesterday morning, but a queue of nearly 300,000 people crashed the site.

Some claim that the queue actually opened before the advertised time and they were kicked out of line.

The supermarket's Delivery Saver is a subscription delivery service which allows customers discounted delivery over a month.

One customer tweeted the supermarket: "I logged on at 5.59 (am) to get ready, only to find over 135,000 in the queue already."

A spokesperson from Tesco said: "The website struggled under the sheer number of people logging on rather than any technological problem."

Customers were urged to consider 'Click and Collect' as an alternative to delivery.