Calum Spence was born profoundly deaf two and a half years ago. He was given a hearing aid two months later but it was of no benefit at all.

In May 2005 Calum was the first person in the UK to receive a Freedom cochlear implant at Great Ormond Street Hospital and since then his hearing has improved dramatically.

Calum's mother Nicky, a part-time NHS technical officer said: "We were told that he would bounce back quickly but to see his progress has been just incredible.

"Two weeks ago I was at the bottom of the stairs and couldn't see Calum so I shouted his name. It was the most fantastic thing to see his little head poke round the top to see who was calling him".

Click to watch Calum and Nicky's interview for BBC London News.