Right hand trunk - has a fork going off to the left of your photo. That forking branch is the one to remove completely.
Also remove any other stems coming off that main, upright stem and growing inwards and crossing. They are likely to rub and cause damage to the bark and let in disease. It will also allow more light into the middle and more air so a healthier plant all round.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Thank you again. Yes, there was lots of cross branches but still some more i can take out. I'll have another go at the weekend and give it a feed. I have another 2 in other parts of the garden but thankfully not as big as this.
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Also remove any other stems coming off that main, upright stem and growing inwards and crossing. They are likely to rub and cause damage to the bark and let in disease. It will also allow more light into the middle and more air so a healthier plant all round.