Debbie Smith 
My Grandparents and the Aliens [EPUB ebook] 

One evening, many years ago when Grandpa and Grandma were much younger, Aliens crash-landed on their small farm in Somerset, changing their lives forever. This is a tale of adventure and humour, as Grandpa and Grandma attempt to help the Aliens return home, helped by Meg the Border Collie and their herd of cows. It involves the consumption of many plates of chocolate biscuits and cups of tea, a trip to the hardware store to buy materials, heavily disguised in coloured knitted hats and mittens, and an awful lot of cow poo