By Marcus Leach

Online grocery retailer Ocado's shares have risen by over 14% following an increase in their sales in 2011.

The firm, which mostly sells Waitrose goods, said that customer orders in the four weeks to Christmas jumped 22% from the previous year, to 405,700.

"We remain optimistic about continued sales growth," said chief financial officer Andrew Bracey.

Ocado saw sales rise 17% to £643 million in the year to the end of November from the previous year.

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