I'd be happy with an all-veggie menu. Easier to prep and store ingredients, fewer food safety issues. More or less as we did at Gt Easton in 2013: Porridge, toast, cereal, jacket potatoes, baked beans, cheese, tomato soup, Haribo [techically not veggie 'cos of the gelatine, I know], crisps and other salty snacks, DIY sandwiches [ok, I think we may have had ham as an option there]. And an ice cream van anchored in the car park
If I really need it, I know where to go to satisfy dirty Full English breakfast cravings, at least from Lincolnshire southwards.