Lots of ways to contact Ian...
Best and often quickest is to email Ian on firstname.lastname@example.org
You can telephone and leave a message on any of his numbers, but apologies in advance, Ian is not good on the phone!! Often conditions are too dusty, wet or even noisy to talk. Ian doesn't sit round in the office much! When not on the works he is driving around meeting and discussing possible future projects with customers.
Text is a good option... feel free on 07973-865850
Ian also tinkers with community wireless networks, he is the co-founder of SussexNetShare, nowadays with WifiFeed technology. Community wireless networks are springing up all over the country. Latest is in Oxford.