Hi Mollie
Your first consideration should be the "for one". Think of all the situations when a meal for one would be eaten - could be for a young child or even baby, single adults, students away from home for the first time,busy families with different meal times due to recreational activities in the evening,elderly people living alone for example, you can think of many more I'm sure. Next consider what types of meals they might like to eat. A toddler may not have the same tastes as an elderly person. There are food fashions and fads to consider. You could do a mini survey here, ask your friends and family.
Off to lots of supermarkets then and see what is available, look at costs carefully between brands, cost is definitely an issue.
To get your thoughts going: I have never seen a cooked breakfast available in chilled ready meals.Do you think some people might find that appealing, if so which groups? And so on and so forth....Brainstorm! The company will be interested in appealing to as many people as possible to increase their profits, find a gap in the market by research and design your new product around that.
Good luck
