UKTV Gardens: What's your favourite style of garden / garden design?
Diarmuid: "Fifties Californian garden design is my favourite. Small spaces, great use of plant and hard landscaping materials, lovely proportions and a good understanding of outdoor living. People like Thomas Church."

UKTV Gardens: What is the coolest plant in the world? And why?
Diarmuid: "The oak tree. It's stately, very old, native and seasonal - it goes through so many brilliant changes in a year."

UKTV Gardens: What has been your biggest gardening cock-up?
Diarmuid: "There are probably loads. What really springs to mind is just going through a mad period of too much gravel and pebble-spreading in the Eighties."

UKTV Gardens: Is the changeable British weather a gardener's friend or foe?
Diarmuid: "Absolute friend. It allows you to plant a fantastically diverse range of plants."

UKTV Gardens: Who is your gardening hero? And why?
Diarmuid: "I suppose Roberto Burle Marx - a Brazilian garden designer/artist/plantsman. He used the native plants of Brazil in a very graphic and dramatic way."

UKTV Gardens: John Steinbeck once said: "There is nothing pleasanter than spading when the ground is soft and damp." Would you agree?
Diarmuid: "Well digging is my favourite thing so I wouldn't disagree. I don't like it too damp or wet though."

UKTV Gardens: What would you be doing if you weren't doing this for a living?
Diarmuid: "I'd be a chef. Or a potter."

UKTV Gardens: Which famous people's gardens have you worked in?
Diarmuid: "We're actually doing Lawrence Dallaglio's at the moment but we've been out to see Jodie Kidd and Sophie Ellis Bextor recently."

UKTV Gardens: Alan Titchmarsh once joked his obituary would read "The Man Who Planked Britain". What will yours read?
Diarmuid: "Good at laying tarmac."

UKTV Gardens: Is decking chav?
Diarmuid: "Not really, like every material, it's a good practical option for certain parts of the garden. Interesting idea, though - Burberry decking! I'm sure it would sell very well in Chingford."