Mortimer and the Sword Excalibur — Joan Aiken

This is the fifth title to be published by Barn Owl about Arabel and her beloved but impossible raven, Mortimer. An enormous hole is being dug in the park and rumour has it that King Arthur's round table is buried there. None of this interests Mortimer however; his fancy has been taken by the giant grass-cutting machine, the LawnSabre. Mortimer finally gets to work the machine but with disastrous consequences for the round table and the sword Excalibur! Another funny and outrageous story about Arabel and Mortimer from Joan Aiken and Quentin Blake.