What caused Ocado's shares to surge, and how did it impact the FTSE 250 index?

Ocado's shares surged 11.3% after supermarket group Asda struck a deal with the technology firm to overhaul its online business across the UK; this surge contributed to the FTSE 250 index gaining 0.8% and heading for a second straight weekly gain.

Why did oil prices slip nearly 2%, and what was the market reaction among UK oil majors?

Oil prices slipped nearly 2% after reports that the U.S. and Iran had reached agreement to extend a ceasefire and lift restrictions on shipping through the Strait of Hormuz; as a result, shares of UK oil majors Shell and BP were mixed.