A half grapefruit with a cherry on top. A selection of breakfast cereals with full cream milk. Yes, I've actually had breakfasts including at least 6 of the items on this list, served with a smile. Lunch was usually skipped on those days. Scottish variations include porridge, with raised eyebrows when you add sugar, and oat cakes.
Irish variations involve soda bread.
The lower prices tend to be further north, and the higher ones tend to be in the high tourism areas such as the Cotswolds. The Lake District is both further north and high tourism, and this is reflected in the fact that rates can vary quite wildly there. All of the above price discussion assumes you'll be sharing the room. Traditionally you will pay your hosts as you leave, but not before your suitcases get put in your car. If you're staying several nights, leaving your suitcases in your room while you're gone for the day is sufficient guarantee that you aren't skipping out on paying.