By Fergal Keane BBC special correspondent

Marie Fatayi-Williams' plea to end violence touched millions

In the days following the 7 July attacks, Marie Fatayi-Williams - mother of one of the victims of the Tavistock Square bus bomb - pleaded for an end to violence. A year on, she has spoken of the impact of her son's death.

When she speaks of her son, Marie Fatayi-Williams always smiles.

Not a pained smile or a wistful smile, but an expression filled with warmth.

In the moment that she mentions his name, Anthony is alive, as vivid a presence as he was when his voice used to laugh down the phone from London, or when he came through her front door with the latest news of his life.

"Sometimes I've found it hard to accept that he's not going to walk through that door, that I'm not going to have those hugs any more, that he's not going to phone and I can only speak to Anthony through his photo," she says.

"But he's saying: 'Mummy, I'm there with you, can't you feel my presence?' and I feel his presence."

Anybody who watched her powerful address in the aftermath of the 7 July bombings will know that Marie Fatayi-Williams is a woman of formidable charisma.

A peace foundation has been set up in Anthony's name

"He was the love of my life," she tells me. "I had him when I was 24 and he was so full of love."

We meet in the gardens of a Lagos hotel, overlooking the expanse of the city's port, where fishermen's canoes skim past great container ships heading for the open sea.

This bustling and chaotic city is where Anthony spent the early years of his life before leaving to be educated in Britain.

For Marie her home neighbourhood in Lagos has been a place of consolation.

Here in Africa she was comforted by family, friends and community. She is married to a local GP, Dr Alan Fatayi-Williams, and the couple also have two daughters.

"My friends have extended their love to my girls, my extended family have extended so much as well as the church. With that extended community feeling everyone has become my family.

"Anthony's death has brought back such family feeling. His death has bought such a change. We just have to stay close. That's what families are for. It's been good in that sense."

The Fatayi-Williamses will be in London for the anniversary

As a devout Roman Catholic, Mrs Fatayi-Williams is involved in working with the poor in Lagos.

She has also set up a peace foundation in the name of her murdered son and has written a book - For the Love of Anthony.

One family friend, Father George Ehusane, of the Catholic secretariat in Lagos, describes her as a "complete human being".

According to the priest Mrs Fatayi-Williams' ability to express herself has helped her to deal with grief.

"Everyone who saw her on television, her lamentation for her son in London, knew that she was unique. Her pain was real. You saw a human being in her emptiness and you had no way of avoiding the tears," he says.

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The Fatayi-Williams are a prominent family in Nigeria. Among their relatives they can count prominent legal and political figures.

One of Mrs Fatayi-Williams' cherished mementos is a photograph of Anthony sitting on the knee of the former vice president, a neighbour and family friend.

One of the hardest things for her to accept is the British government's refusal to grant a full public inquiry into the 7 July bombings.

"There must be a public inquiry. I lost my son. Others have lost loved ones.

"You can't tell us to forget it, move on and sweep it under the carpet...it's not acceptable in a civilized society. If you have nothing to hide then you let others have a look at it."

Anthony's father, Dr Alan Fatayi-Williams, shares his wife's outlook.

As a Muslim he is bewildered by the actions of the suicide attacker, Hassib Hussain, who detonated the bomb on the Tavistock Square bus.

"Islam is a religion of peace. The people who do this are a misguided minority and it is very unfortunate they were misguided by other Muslims who were teaching violence. This is not what Islam stands for," he says.