Favorite hotel-traditional English breakfast combo

My father and brother have two nights in London one night in the Cotswolds in August. We'd like a good value place to stay in both locales, but would be willing to pay a bit extra to stay at a place that includes a knockout traditional English breakfast. Value less important than the experience, but we're not exactly rich. Any thoughts?

Also, any recommendations for places that have a full afternoon tea? I am aware of several high profile cliches in this area, but do you think they're so good as to be actually worth the trouble? Where would you take the in-laws for tea, assuming you wanted to show love for them more than impress them?