 Following yesterdays black day for retailers ASOS, Boohoo and Halfords all issued profit warnings Tesco PLC LSE:TSCO shareholders maybe a bit apprehensive this morning. Tesco PLC is set to update the market and analysts at Barclays predict a 1.8 decline in like-for-like sales for Tesco, albeit this would represent a gain of about 7.3 on pre-Covid levels. 