When Daniel Turner lines up at the start of the London Marathon, it will represent yet another milestone in a four-year fundraising campaign.

The 29-year-old NHS electrician, from Moreton Hall in Bury St Edmunds, has been on a mission to raise money for the children’s cancer charity CLIC Sargent since losing his girlfriend, Michelle Dring, to the disease in October 2009, aged just 24.

After witnessing first hand the plight of children with cancer in Addenbrooke’s Hospital – and the brilliant work of the charity – Mr Turner was determined to “give something back”.

So far, he has completed a skydive, run a half marathon and written to more than 200 celebrities asking them to donate items which he then auctioned on eBay.

After he has run the London Marathon, Mr Turner has three Spartan races lined up – a total of 24 gruelling miles across a series of obstacles. And as if that were not enough, he has signed up to climb Mount Kilimanjaro next year.

His niece Chloe Smith has added to the pot by organising cake sales at her school.

Mr Turner said: “Michelle already had the brain tumour when we met but we thought things were improving – then it came back.

“We didn’t have long together, but because we knew how ill she was, we packed everything we could into that short space of time.

“I went with her to all the hospital appointments and it really struck me seeing all the young children in there with cancer. CLIC Sargent had a centre at Addenbrooke’s so I could see the value of what they do.”

By the time he has finished all of the challenges, Mr Turner should have raised more than £7,000.

To donate, visit http://uk.virginmoneygiving.com/danielturner84.