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He said that although the mustard weed does regrow, progress has been made over the years.

The species is biologically fascinating - it has the remarkable ability to regrow any part of its body that is damaged or lost.

A large portion of the tree's trunk remains, and people visiting the site told the BBC they hoped it would start to regrow, even if it took decades, or centuries.

"This idea of replacing the tooth in a biological way by regrowing it, drew me to London and to King's," explained the director of regenerative dentistry, Dr Ana Angelova-Volponi.

Some have experienced smoke damage and may have looked dead in their bare winter appearance, but a scratch beneath the bark’s surface shows that many of the trees will regrow.