Intrepid walkers from Colliers International’s Bristol office will be swapping suits and ties for all-weather gear and walking boots when they take part in a challenging 100km charity trek around the Yorkshire Dales.

Commercial property experts Nick Williams, Mike Bull, Richard Wright and Mark Kelly will line up alongside around 300 other teams for the notoriously challenging Oxfam Trailtrekker – tackling the rugged Yorkshire Dales course in just 30 hours from June 1-2.

The challenging terrain, which takes in rocky peaks and lowland bogs and marshes, includes climbing the equivalent of Ben Nevis and Snowdon during the thirty hour time frame.

Nick Williams from the Broad Quay-based team said: “Around a quarter of the people taking part in the trek don’t manage to finish the course, and just a third of the teams finish with all four members in one piece. It’s recognised as one of the toughest challenges of its kind.”

The Bristol team has been practising for the event with gruelling expeditions to the Brecon Beacons in some of the foulest winter weather conditions imaginable and team members are determined to complete the course together.

Richard said: “We have been training as often as possible in what has been the second coldest March on record.”

Mike added: “Some of our colleagues seem to imagine we are in training for a nobbly knees contest but Trailtrekker is recognised around the world as a seriously impressive challenge.  It’s a day and night event which requires great determination and teamwork.”

The team’s fundraising website is