Some good suggestions here. Roast pork with apple sauce and stuffing is a good idea as a lot of pork is eaten in the Philippines, and it fulfills the idea of a roast dinner.
Definitely use some English fruits such as plums, blackberries, apples in the pudding, so crumble, pie, or poached fruits would be nice. Clotted cream or home made custard to accompany. I’d check with your nephew about food intolerances before you plan your menu.
Definitely British cheeses , chutneys, biscuits, and maybe celery and carrot sticks rather than grapes to accompany the cheeses.