Donald Trump is using an 80-year-old family crest granted to the original owners of the Mar-a-Lago estate as his own, despite being banned from using it in the UK by the coat-of-arms authority in Scotland.

Joseph Tydings, 89, whose grandfather Joseph Davies registered the crest in 1939, said the family was furious when it found out that Mr Trump was using their heraldry.

The president continues to use the crest in the US, with the word “Integrity” replaced with the word “Trump”. He is banned from using it in Britain, owing to the Lyon King of Arms Act, passed by the Scottish Parliament in 1672. In 2007 Mr Trump went to court to be able to use the heraldry, but lost the case in 2012. He does, however, use the crest in the US, which has less strict laws about heraldry. It now adorns all his golf courses and merchandising.