By Laura McGuire After a colourful year, online supermarket and automation giant Ocado will later this week unveil its earnings for 2023. Shares in grocery tech firm are down by around three-quarters from their short lived lockdown peak of early 2021. Its retail arm, which it shares 50-50 with Marks and Spencer, already offered an encouraging trading update in January, as customers fell back in favour with the brand following a series of price cuts. The posh grocer said it was boosted by its highest level of sales over Christmas, selling over 90 per cent of peak slots released by mid-October. …