Here is the evidence - one cache box. The kids loved where it was hidden as we disappeared behind a hedge away from all the walkers. We took something with us to swap over but the kids decided that they didn't want to in the end. I think they didn't like the look of anything in the box, but they are up for doing another one, and I suspect sooner rather than later. Maybe next time we'll even manage it on a day when there isn't an ice cold wind blowing whilst raining.
I think I could be hooked already as I've just spent half an hour looking for caches in and around York. Might need to get a gps gadget!