One of the interesting aspects of building a garden at the Chelsea Flower Show is that you get to go to a really varied number of places. Last year, whilst preparing for the Daily Telegraph’s garden with Ulf Nordfjell, I visited a wonderful quarry in northern Sweden. Maybe a deserted airfield near Braintree in Essex wasn’t quite so exotic but still quite interesting! In order for the coreten to develop a consistent rust colour, the steel needs to be sandblasted and this was what was happening to these sections. On Monday, they get delivered to site.