Big Red Lorries with Ladders Down the Side

Although Lyra had hoped to test drive a plane during her visit to Heathrow this morning, she was happy to settle with a fire engine...

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The title refers to the time that my (bipolar) mother accidentally set our chimney on fire during a not very well patch. She called 999 but just couldn't think who she was meant to ask for so she asked desperately "Help! I need you to send one of those big red lorries with ladders down the side!". And they did.