The Crown almost used CGI to make Olivia Colman look more like the Queen

• When is The Crown season 3 on Netflix? Who is in the cast, and what is going to happen?
• Gillian Anderson is confirmed to play Margaret Thatcher in The Crown season 4

Colman was originally fitted with blue contact lenses, but director Ben Caron – who helms the first four episodes of the new seasons – told The Guardian that it was as if "she was acting behind a mask".

“It was as if we had taken all of her acting ability and put it in a safe and locked it away,” he said.

The other option that was explored was to use visual effects to turn her eyes blue in post-production. “But it didn’t feel like her," Caron explained. "CGI-ing her eyes seemed to diminish what she was doing.”

As a result, Colman's eyes will remain brown in the finished product, so viewers will just have to make that leap of imagination.

The star previously admitted that she felt "horrendous" replacing Foy on the series. “Everyone loves Claire Foy, so I have got the worst job in the world at the moment," she said. “The first week, I did feel myself trying to do Claire impressions."

The Crown will drop new episodes on Netflix on 17th November.

It was announced yesterday (7th September) that Gillian Anderson will appear in the following fourth season as Margaret Thatcher.