British online supermarket Ocado said its retail revenue growth slowed in its latest quarter, hit by last month's huge fire at its flagship robotic distribution centre. 

The firm last month announced a joint venture with Marks and Spencer.

It said its retail revenue increased 11.2% to £404m in the 13 weeks to March 3, its fiscal first quarter, having risen 12% in the previous quarter. 

Before the blaze, Ocado's Andover site in England was providing about 10% of the firm's UK capacity. 

It warned in February of a reduction in sales growth until it can increase capacity elsewhere. 

Ocado said its initial assessment of the reasons for the fire gave it confidence there were no significant implications for the risk profile of the assets or the viability of the model.