Sorrell, Twitter, Tesco: Everything that matters this morning

Sorrell defies WPP by sealing MediaMonks takeover
Sir Martin Sorrell has completed the purchase of Dutch digital production company MediaMonks in clear defiance of WPP’s claims that the acquisition is “unlawful”.
The first takeover made by Sorrell’s new advertising company S4 Capital is thought to be worth €300m (£266m) and will comprise a mix of cash and shares, according to BBC reports.
In a statement S4 Capital described the merger as representing its first