Ursula Martin was diagnosed with ovarian cancer aged 31 and walked around Wales to raise money for a cancer charity: she recorded the experience in One Woman Walks Wales. Hannah Engelkamp’s book and film Seaside Donkey were based on her experience travelling with this companion around Wales. Hannah’s meanders are now accompanied by her toddler, Osian, who inspired her current writing on ‘wilding’ childhood and what the ‘dériving’ and colonialist habits of infants can teach us about travel. They talk to Gwen Davies.