Breakfast - warburton crumpets, most supermarket sliced loaves, dairy free spread such as vitalite, oats, dairy free milk, weetabix, fruit, jam, peanut butter, marmite
Lunches - pitta bread, hummus, tinned or fresh veg soup is usually ok (or homemade even easier) jacket potatoes - tinned veg chilli or fresh, beans, hummus salad sandwiches
Dinners - pasta tomato sauce with veg and tinned green lentils, veg curry, vegetable fajitas with Heinz Mexican beans and avo, roast vegetables, potatoes and Linda maccartney sausages or country pies, veggie stir fry with rice or rice noodles
Snacks - hobnobs, Oreos, bourbons, walkers ready salted, prawn cocktail, roast chicken and Worcester sauce flavours, hummus, olives, veggies, oatcakes, fruits - bananas are a staple ;)
Takeaways - Pizza Hut do fully vegan pizzas with vegan cheese, most curry houses no longer use ghee so can easily accommodate for Vegan curries, Chinese takeaway also pretty good if they serve rice noodles :) most vegans comfortable enough with chippy dinner with mushy peas or beans - as long as not fried in dripping (some not pleased with fried in veg oil if fish is fried in same container x contamination)
Also in the ingredient list any actual milk / whey / egg will be in bold. Some labels (is Oreo) state 'may contain milk, eggs, nuts etc' all vegans I know take that as the legal allergy warning and will happily eat it so don't fear that nearly all labels may say 'may contain'
Good luck hosting and I'm very sure they won't mind you eating completely as normal - I wouldn't mind and I'd be chuffed at the comfort you're planning on going to!