1. Make it boring.
2. Make it completely believable.
3. Convey the ‘evidence’ in an unremarkable way.
4. Fall way short of the standards set by previous April Fools.
5. Make sure it’s so underwhelming that no one wants to pass it on.
6. Waste the licence fee-payers’ money when times are tight.
7. Put it on YouTube with a title that mentions April Fool.
And, of course, it’s in the same territory as last year’s corker: