Winston Marshall, banjo player and lead guitarist of Mumford & Sons, has quit the folk-pop band.

The 33-year-old admitted that the departure was a "difficult decision first brought about by an unintentional Twitter storm".

Marshall caused controversy earlier in 2021 after tweeting about US journalist Andy Ngo's book Unmasked: Inside Antifa’s Radical Plan To Destroy Democracy.

In a now-deleted tweet, Marshall said he had read the "important" book and he praised dangerous, far-right activist Ngo as a "brave man".

Declaring his departure from Mumford & Sons, whose other members include Marcus Mumford, Ben Lovett and Ted Dwane, the musician said being a part of the Grammy-winning outfit has been "exhilarating".

"From odysseys through the Scottish Islands to headlining Glastonbury, from The Betsy Trotwood to Madison Square Garden," he wrote in a statement.

"We’ve done it all. What a blessing it was to be so close to such talent as those three lads. I will look back at it all with immense pride and love. However, after much reflection and consideration, I have decided it is time to move on.

"This is a difficult decision first brought about by an unintentional Twitter storm."

Explaining that he tweeted about the book in March, he said: "The book documents the recent activities of the extreme Left in the US.

"The tweet was misconstrued by many as an endorsement of the equally abhorrent Far-Right. Nothing could be further from the truth. I condemn unequivocally all political extremism, be it of the Right or Left."

He continued: "At the time of the incident emotions were high and despite the furore, the band invited me to continue with them. Considering the pressure, that took courage.

"I’ve spent much time since reflecting, reading and listening. I know now that, as long as I am a member of the band, speaking my mind on the evils of political extremism could bring them trouble. My loyalty and love for them cannot permit that.

"However to remain in the band and self-censor will gnaw my conscience, erode my integrity. By leaving I hope to speak freely without them suffering the consequences."

Marshall, the son of wealthy British investor Sir Paul Marshall, also wrote that he was looking forward to "new creative projects as well as speaking and writing on a variety of issues".

He intends to continue working on Hong Kong Link Up, a non-profit organisation which "aims to link up British residents with Hong Kongers arriving in the UK".

His statement ended saying: "The band has been the ride of a lifetime. I leave with love in my heart and I wish them nothing but the best.

"To the band, colleagues, partners, crew, everyone who ever came to a show and everyone that supported the band, I thank you."

“Why I’m Leaving Mumford & Sons” by Winston Marshallhttps://t.co/JUraN3IDr3

— Winston Marshall (@MrWinMarshall) June 24, 2021

Marshall also published an essay on Medium.com where he further explained his reasons for leaving the band and praised his bandmates for supporting him despite the rise of "so called 'cancel culture’".

Reminiscing on the aftermath of his tweet, he wrote: "Emotions were high. Despite pressure to nix me they invited me to continue with the band.

"That took courage, particularly in the age of so called ‘cancel culture’. I made an apology and agreed to take a temporary step back.

"Rather predictably another viral mob came after me, this time for the sin of apologising. Then followed libellous articles calling me ‘right-wing’ and such.

"Though there’s nothing wrong with being conservative, when forced to politically label myself I flutter between ‘centrist’, ‘liberal’ or the more honest ‘bit this, bit that’.

"Being labelled erroneously just goes to show how binary political discourse has become. I had criticised the ‘Left’, so I must be the ‘Right’, or so their logic goes."

Paul Marshall later tweeted, "Very proud of my son!" after the Medium.com article went live.

In March, Marshall tweeted to say he was stepping back from Mumford & Sons to "examine my blindspots".

He said: "Over the past few days I have come to better understand the pain caused by the book I endorsed. I have offended not only a lot of people I don’t know, but also those closest to me, including my bandmates and for that I am truly sorry.

"As a result of my actions I am taking time away from the band to examine my blindspots.

"For now, please know that I realise how my endorsements have the potential to be viewed as approvals of hateful, divisive behaviour. I apologise, as this was not at all my intention."

Unmasked saw Andy Ngo’s spread false, disproven claims about the left-wing anti-fascist movement known as Antifa".

Revisit Hot Press' 2015 interview with Mumford & Sons here.