I really should know this but what is "the Prime Minister" in law? I know the Queen appoints (agrees?) a government but who decides the PM?
                        
                        
                        
                        
                                                
                    
                    
                                    
                    
                        
                        
                        I& #39;m sure Twitter& #39;s constitutional experts will know  @carlgardner  @AileenMcHarg  @Prof_Phillipson  @davidallengreen  @RobertCraig3  @colmocinneide etc
                        
                        
                        
                        
                                                
                    
                    
                
                
                        
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