This is one of the Trust's biggest and most successful campaigns ever - encouraging kids and families to get outside and enjoy nature with a practical, fun list of activities - everything from flying a kite, organizing a snail race, to building a den, to hunting for fossils. With concerns about children not getting enough exercise and losing touch with the countryside, it's very timely.

They'll be running it again in 2014, launching in May and running through the rest of the year with another year-long publicity blitz. This won't be just preaching to the membership, there will be national press adverts as well.

The 50 activities will be the same in 2014, and our book will be minimally updated - a new cover, new chapter openers, a few text changes.