I'm planning a trip to London in late May. One of my traveling companions has requested a day in the Peak district. She has mentioned Castleton, but is not fussy on location. She has mentioned she would like to see the national forest.
Since we are based in London, I would like a trip that allows us to return to London rather than staying in Derbyshire.
Can anyone recommend a good city or way to explore the forest in a day trip? We will have a Britrail England pass, so traveling during rush hour is not a problem. We have been to England before and traveled mostly in the southeast. This trip will be similar and this is the farthest north we are going. Any suggestions would be welcome.