Tracy and Peter live in a 3-bedroomed semi-detached 1930's ex-council house in Surrey with their 10-year old son Ayrton, and 2-year old daughter, Piper.

Peter is an architect and Tracy is a stay-at-home-mother, writer and gardener.

They are refitting their house and garden to increase energy efficiency and self-sufficiency.

"Our house is a very, very, very fine house,
With two cats in the yard,
Life used to be so hard,
Now everything is easy 'cause of you."
Crosby, Stills and Nash - Our House