A nice fun series that we had to abort half way round the summer before last. This turned out to have the fortuitous consequence that we since we'd already solved them, we could collect the remaining two, and easily qualify for the Surrey Resuscitator cache in Westhumble.
I collected #3 a few weeks ago. This one turned out to be missing but we noticed that it had now been replaced and so it became Bobcats Resuscitator qualifying cache. It took a bit of finding but fortunately we'd picked a muggle-free time.