The sound of 100 pairs of laces being tightened and water bottles filled is almost audible at Credit Suisse .

That is the number of employees from the Canary Wharf office of the global financial services firm taking part in a continuous relay run from Land’s End to John O’Groats.

The first runners will set off on Wednesday, June 8 and the aim is to complete the 1,400km trip in six days to raise funds for children’s charity NSPCC .

The race is being split into 18 stages, ranging from 80km to 100km in length, and each stage will be tackled by a team of up to eight runners within a time window of eight hours.

Since 2005 the company’s Enduro Challenge events have raised more than £700,000 for charity.

Participant and event organiser of this year’s event Keith Garbutt said: “For 2016 we wanted to do something even bigger but also more inclusive.

“Running the length of Great Britain is a fitting challenge, and it’s inspiring that 100 colleagues have volunteered to take part.”

NSPCC is the chosen UK charity of the year for Credit Suisse in London, and it has so far raised £232,000.

NSPCC partnership manager Helen Stock said all the money Credit Suisse raises will go towards the Speak out. Stay safe schools service, providing children with the knowledge and understanding they need to stay safe from abuse and neglect.

She adds: “Together the Credit Suisse Enduro team are taking on a truly unique and amazing challenge to help keep children safe.”