How does/can the CMA block the deal? I don't understand the legal practicalities of this. Let's say I want to buy a packet of Cheesy Quavers (who doesn't?). The Snack Regulator decides I can't and outlaws it. I walk into a shop to buy a packet anyway. At this point the police can block me, or, after I've made the purchase, issue a fine. If I refuse the fine, they can send the Police in to arrest me. Ultimately they can force me to comply through threat of sanctions. Or if not me, the vendors, threatening to imprison anyone who would dare sell me a packet of Quavers.
In the case of MS, what can the UK government do? Short of banning MS operating in the UK, I can't see them bringing sanctions powerful enough to affect MS, and they can't ban MS as too mucy is dependent on MS's continued operations. I mean, they can stiff MS with a honking great find, but if MS says, "no, we're not paying," then what? They don't have control of the governing body of ownership to prevent the sale going through and MS legally acquiring AB, so what exactly can they do to 'block' the deal?