Nanoblitz started just south of Birmingham, but has now spread to other parts of the West Midlands. The majority of the caches are nanos (though the Nanoblitx XL caches can be much larger), but are all cunningly disguised, with many making use of household objects.
Make sure you have your favourite points saved up for this one!
There is no set route or loop, just look at the caches on the map and make up your own route.
⏱️ Allow several trips! List of current Nanoblitz caches