She depicted the architectural history of England from antiquity to the 20th century, working in collaboration with her husband Walter Ison, the poet John Betjeman and others.
[1] Shortly after the Second World War, the Isons moved to Bath, which they found the Georgian architecture decayed and in danger of demolition.
[5] From the mid-1950s until 1962, the Isons lived at Rainham Hall in Essex, securing a lease on the Georgian house from the National Trust.
They made the house, which had recently secured Grade II* status, available for public visits on Wednesdays and Sundays.
[7] Leonora and John remained in correspondence until his death,[7] and later contributed drawings to Frank Delaney's posthumous biography of the poet, in which he noted she "captured Betjeman country in its heyday...a visualising amanuensis.