Pav is supplying the ambience to the opening of an all-year-round Christmas store. And by 'ambience' he basically means Nigel and Rachel singing carols. The ghosts of Christmas past mean this can only be an unpleasant experience for Nigel. This is compounded by Stan's attempts at securing a tree, Marco's suspect catering promises and the manager of the store who fancies herself as Letchington's answer to Mariah Carey.