Banksy is dedicated to his ambition to become mega-rich through his various money-making schemes. His business partners - and next-door neighbours - are the Baxter Brothers. Billy has boundless confidence and enthusiasm, and Sam is six going on sixty. And then there's Dingdong, their cousin, who is reluctantly allowed to join in, especially if she can help them out of a tight fix...
Two stories in one!
THE GERBIL FACTORY
When Sam tells Banksy and Billy the cost of a gerbil the boys quickly calculate the wonderful profits they could make if they went into the gerbil breeding business. The only trouble is it takes one of each sex to procreate and so far they only have two unwilling males... 
THE HAPPY HAIR SALOON
Dingdong's grandma is visiting, which always means one thing - going for a haircut. But it also means she has a ten pound note. Ten pounds!! For a share of that Banksy, Billy and Sam will do the job and no one will be any the wiser. Unbelievably, the results are not bad.  And so, over half term their shed is rapidly converted to The Happy Hair Saloon...