Before visiting Lundy make sure you obtain an accurate brief on the condition of the runway. I flew there a couple of years ago in a 172 after having been advised the grass "had recently been cut".
The grass was, in fact very long and if it hadn't been for a 30knot westerly we would have spent the rest of the day mowing the strip, assuming we could have borrowed a mower from the N.T. on a Sunday!
Even with a strong wind there was very little runway ahjead when we clawed into the air. Once airborne the updraft from the cliffs gave us a very rapid climb.
I have a lot of grass strip experience and would love to go again because it's a very interesting island to visit but I would need to be assured that the runway was dry with short grass to provide an adequate safety margin. Definitely a strip for pilots with adequate short field experience.