 John and Bernie run the Winchester. These are the real names of the  landlord and landlady who used to run Simon Pegg (qv)s local pub,  the Shepherds in Highgate. John used to make toasted sandwiches for  regulars, hence the reference to "the Breville out back." Pegg and  Nick Frost (I) (qv) were regular attendees of the Shepherds  Thursday night quiz, hence the line "we do the quiz" when Shaun is  knocking on the Winchesters door. Chris Martin (XI) (qv) of  Coldplay (qv), who plays a zombie in the film, also used to attend  quiz night.