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Over the years, there have been suggestions to modernise the system: coloured lights, digital alerts, or even televised votes.

Starbucks said in April that its baristas would wear dark, single coloured shirts to "allow our iconic green apron to shine and create a sense of familiarity for our customers".

The brightly coloured birds have been attracting amateur photographers to the park.

There were calls of "Carlo" - Italian for Charles - from crowds waiting to see the royal visitors and local media also seemed interested by their car, the claret coloured State Bentley.

The Great Depression and the Second World War coloured Roosevelt's time in office - and are often cited for his extended presidency.