Deke -- just in case it's not obvious, some of the above suggestions are made with tongue firmly in cheek, and those which are serious reflect what people in England are eating nowadays but aren't perhaps what a captain would offer to her crew if she's trying to impress them with examples of good old English cooking!
Though actually as you might have twigged from Mouse's suggestion of pizza etc as well as the chicken tikka masala VB and I mentioned, actually defining English cooking isn't that easy now. In the last 70+ years what we routinely cook and eat has changed drastically and undoubtedly it will change further in the next 70 years. There are plenty of adults in the UK who haven't even heard of eg plum duff or spotted dick let alone eaten them. Instead much of what we eat nowadays is taken direct from other cultures -- not just the ingredients, which has always happened, but the recipes themselves, though not always with scrupulous authenticity.
In addition, what your captain will think of as British cuisine is going to depend on what she was brought up eating, which in turn is going to depend on her family background. Someone with Indian ancestry is likely to have different memories of the food of her childhood when compared with someone whose family hail from Africa or the Caribbean, and the more there is a melting pot of cultures within the UK, the more so-called fusion food is going to appear. And, as ever, class and family income are going to play a part -- the rich and upper middle class will have a different diet from someone living on the breadline on a council estate.
And all of that is before you factor in what might happen in the next 100+ years as to food production, meat consumption, fish farming etc.
So rather than ask us what we're eating now in the UK, it might be an idea if you pin down your captain's precise family background and her interests -- some people don't care about food and would just tell the chef to prepare whatever he/she likes; someone interested in history might want to have dinners based on specific eras (though hopefully not the 1970s...). If we knew more about that and what developments you think have happened in food worldwide between now and when your story is set, we might be better able to help you.