I have an order in for a few items at M&S, but just saw Sainsburys have a pre-order catalogue too. In the past I ahve suspected that they use the same suppliers across certain products, like frozen bags of cauli cheese seem identical. I notice the Sainsburys Porchetta is £22 for bigger size than M&S at £40. What are the chances that M&S is far superior?? They have many very very similar items but in different packages, could they actually be the same? Sainsburys is far cheaper. Anyone familiar with the Sainsburys Christmas food?