Susan_F, this does sound like an oversight on the indexer's part; thanks for bringing it to our attention. I don't own this book, but there is a Look Inside/preview of the ebook on amazon.co.uk; part of the problem might be that, since many of the recipes are free-form/narrative in nature, Nigel doesn't often give precise measurements or quantities, so it can be difficult to determine exactly how many the recipe will serve. I've asked the original indexer to revisit these recipes and index Cooking for 1 or 2 wherever it's directly indicated or clearly implied that the recipe serves 1 or 2 persons.
In future, you can use the "Report an Error" link that appears at the bottom of every EYB page, or just email me directly at [email protected].