"God bless you, Gordon Banks," Mr Marlow wrote in the caption.

"Hello Lucas, your dad told me that you want to be a goalkeeper? Good lad," said Banks. "We always need good goalkeepers."

In the transcript Banks encourages the eight-year-old to train with a smaller ball, as "playing with a bigger ball will seem much easier" and test his reaction speeds with table tennis and tennis balls.

The former England international, who won 73 international caps, also tells Lucas to keep practising as "the more you play, the more your eyes will get better at spotting the angles".

"You have to be brave to come out for crosses, or dive at the feet of a centre forward trying to score past you," Banks said. "And be brave too, if you lose or make a mistake.

"We all make them – I made some mistakes – but I never let anyone see I was upset."

The transcript did not make Mr Marlow's final article for the local paper and he instead wrote it up for his son to put on his wall.

"This morning when I heard he died I checked and it's still there on my son's cork board," the 48-year-old told the Press Association.

"The transcript tells us he's a decent, down-to-Earth and lovely man really. He showed a genuine interest.

"He didn't have to say all that, this World Cup winner, but he took the time to give advice to an eight-year-old boy he never met, and it's a testament to the man.

"When Lucas made mistakes he would drop his head and Gordon gave him this brilliant advice not just for football but for life really."

Mr Marlow said his son, born in 2003, was not sure who Banks was when he first gave him the transcript so showed him some classic footage, including the goalkeeper's memorable save from a Pele header at the 1970 World Cup in Mexico.

"We watched it over and over again and my son asked 'how on Earth did he save that?'" said Mr Marlow. "I said it's because he was the best goalkeeper in the world son – and this is his advice to you.

"After that letter he got to know all about Gordon Banks. I remember he made a save once where he managed to tip a low shot over the bar.

"When they came off he told me 'That was just like that Gordon Banks save wasn't it?'

"It wasn't quite as good as Banks' save but I said 'Yes son, it was just like it'. He remembered and it touched him."

Lucas is now 15 and is still a goalkeeper, now playing for his local Whitwick Under-16s side.

Mr Marlow, now a journalism lecturer, added that he had been nervous for his interview with Banks.

"I had interviewed rockstars in the past and rarely got nervous but Banks was a bona fide legend," he said. "But it was like talking to a bloke in the pub, he was just a really decent, easy-going man."

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