Queen uses a walking stick at Westminster Abbey service with daughter Princess Anne

Queen Elizabeth attended a service of thanksgiving at Westminster Abbey today, marking the Centenary of the Royal British Legion.

However, it was an accessory Her Majesty was carrying that caught many people's attention.

The 95-year-old monarch, who is patron of the charity and attended the service with daughter Princess Anne, held a walking stick during the public appearance.

Beaming broadly on arrival, the monarch, dressed in a striking blue coat with Queen Mary's Russian brooch pinned near her shoulder and a matching hat, greeted The Very Reverend Dr David Hoyle, Dean of Westminster.

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Princess Anne, 71, exited the car on the sunny autumn day wearing a coat featuring multiple purple hues and held onto her mother's retractable cane.

It's not the first time the monarch has used an aide to walk, Her Majesty was previously pictured with a cane following knee surgery in 2003.

However, no medical reason has been given for its use today.

The Queen took a shorter route to her seat than usual, going into the Abbey from the Poet's Yard entrance instead of the traditional Great West Door, according to Hello! Magazine.

Her Majesty's use of the walking stick was "for comfort" and may have something to do with the cobblestones at the church's entrance, according to Mail Online.

The special service was put on to highlight the RBL's enduring legacy over the past century, as well as its ongoing work supporting and commemorating those from the UK and Commonwealth communities who serve, or have served, in the Armed Forces.

Princess Anne gave a reading during the service.

As they left the event, the mother and daughter duo were handed flower posies by children outside the abbey.