i am doing a boxing day buffet for approx 14 people. It's going to be centred around cold cuts the two 'centrepieces' of which will be a roast ham (nigella's coca cola one of course) and a roast beef. I have ordered from the butcher a 2kg piece of each - is that gonna be enough? There will also be salamis, smoked salmon and various salad things and small roast potatos. I am new the this buffet thing and feel OK about making everything but the quantities are a bit baffling. Personally i tend to stuff myself whenever in sight of a buffet but i know not everyone is like that . Any advice gratefully received as always.