Misc: The lumbar spine consists of how many vertebrae?

Questions

Botany - Which tree only produces acorns after it is fifty years old?

Britain - How many inches tall are the bearskins worn by the guards at Buckingham Palace?

Britain - In the House of Lords, where does the Lord Chancellor sit?

Britain - In which park are Queen Mary's gardens?

Britain - What are the only two london boroughs that start with the letter 'e'?