What actually makes a great modeller? Penny Tompkins and James Lawley should know. They are not only expert modellers themselves, but have undertaken a number of modelling projects in which they have modelled great modellers.

It was always going to be an adventure — the first interview maverick therapeutic genius David Grove had given since 1996. So maybe it wasn't surprising to find myself dangling upside-down in a dark, sub-zero November car park on a psycho-active fairground ride. Maybe I should have expected another result, too: massive personal change at the deepest level. That's what I got.