A memorial service to mark the anniversary of the death of seven-year-old Zane Gbangbola was attended by dozens of people.

Zane, a pupil at St George's Junior School, Weybridge, was taken to hospital last year after being overcome by fumes when the basement of the family's riverside property in Chertsey filled with floodwater, and later died.

People gathered at the family home on Sunday, February 8, which they have not been allowed to enter since the flooding, to hold a minute's silence before setting off fireworks and releasing Chinese lanterns into the night sky.

His father, Kye Gbangbola, 48, wrote a letter to his son, a year on from his death.

He wrote: "I miss you every moment of the day, I pray constantly to see and hear your beautiful voice again, I cannot understand how one so precious and promising can be taken."

He spoke of others sharing their memories of Zane. An 85-year-old man described Zane as "the most compassionate person I have ever met".

Mr Gbangbola said in his letter: "My biggest wish is that people stand up for you as you stood up for them, as young as you were.

"I don't know what most think of your mum and I. But I do know what they would think if they lost their child, they would be devastated and want truth.

"So I ask their conscience to stand up for what is right and show solidarity with a parent in need.

"The authorities knew immediately what had happened, all they need to do is tell the truth, it makes it difficult asking children to tell the truth if certain adults can't.

"Zane you made me the proudest dad ever, I miss you Zane and always will. Till we meet again."

More than 17,000 people have now signed a petition to demand answers from authorities about his death.

Zane's parents have spent the past 12 months trying to get to the bottom of why he died but an inquest has still not been held.

Police said Zane died from carbon monoxide, but his parents said this was impossible because their house was fully electric.

In January, the Secretary of State for Environment, Food and Rural Affairs, Liz Truss, wrote to the Environment Agency (EA) calling for urgent tests of a lake behind the family home.

An EA spokeswoman said: "This is a tragedy and our sincere sympathies are with the Gbangbola family.

"In response to the Secretary of State’s request we took water samples from the lake on Thursday, January 8.

"These have been analysed by our National Laboratory Service and the results sent to the coroner as part of the formal inquest."