She could sing (in a ear-bashing rounabout kind of a way) and he had a mildly dubious 'talent' for comedy stage-hypnotism, so they were encouraged to do pub gigs as well as doing their ordinary jobs (both worked in banks).
The H took the train instead of drove to work which was a projected saving of £2,800 in running costs and parking over the 2 years.
The W took to walking the kids to school saving them additional running costs on their 2nd car.
The W was strongly encouraged to give up her 70 a week smoking habit, projected saving of £1,800 over 2 years.
He was a gadget freak and so his £200 a month boys toys spend was cut, too.
She was a store-card-a-holic, so her spending was also cut drastically.
They were allocated a budget of £155 a week after mortgage and utilities.
Basically they had to live a very pared down lifestyle in order to achieve the savings.