 Ostensibly the biggest corporate item on the City diary is an update from Ocado Group PLC LSE:OCDO but this trading statement is probably more Marks and Spencer Group PLC LSE:MKS Marks and Spencer Group PLC LSE:MKS, to which the online grocer sold a 50 share of its UK business last year. Back in September, the pair warned that additional costs for hiring van drivers and the recovery from the fire at the Erith depot will add 5mln extra costs to this years results, as well as costing 10mln in lost orders and a further 10mln from stock and asset write-offs, partly offset by a 10mln insurance payment. 