Mark Preistman, Natural Stone Specialist magazine columnist and a Partner at training providers Priestman Associates, is taking part in Shine!, London's 26 mile night time walking marathon, on 26 September to raise money for Cancer Research UK. If you are feeling generous, you can make a donation on the Just Giving website (www.justgiving.com/priestmanweb) or by texting 70070 with the message MPJG99 and the amount (whole pounds only) you are giving.

Mark says: Thank you.