The Count UP

27 is a perfect cube - 3 to the power of 3

Or if you want something more obsure - it's the highest level of knowledge in rupaloke (Buddhism).
 
29, days in february in a leap year!
rep
I saw on your profile Andy that you mentioned Greenditch Ave are the Blocks of Flats still there at the end and is the grassy area by the stream still called the dump as it was back in the late 50 early 60's? and I seem to remember the school was Whitehouse Junior school or at least it was when I lived there and went to that school.