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He also had glue ear - when the middle part of the ear canal fills up with fluid - which gave him even more hearing loss.

In fact, until the age of eight, Johnson was severely deaf because of glue ear, a condition where the ear canal fills with fluid that can cause temporary hearing loss.

Until the age of eight Boris was severely deaf with glue ear and was a subdued child.

"He is fine conversationally - it's like having glue ear," she says.

Coutts ticks off a litany of family horrors like a shopping list: "In the space of three weeks, between us we have had hospital stays, fits, diarrhea, speech loss, tonsillitis, swollen feet, mobility loss, demoralization, ambulances, glue ear, and holidays...."