"Heads on sticks" are used to check camera blocking at the Royal Festival H...

"Heads on sticks" are used to check camera blocking at the Royal Festival H...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

Staff members use "heads on sticks" to check camera blocking at the Royal F...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

A staff member uses "heads on sticks" to check camera blocking at the Royal...

Staff members use "heads on sticks" to check camera blocking at the Royal F...

Staff members use "heads on sticks" to check camera blocking at the Royal F...