as the Addison Act. The Act was designed to address the shortage of quality housing for working people and provide homes for the thousands of troops returning from WW1. Houses built under the Addison Act are often referred to as "homes for heroes". On 4 July 1919 Dr Christopher Addison visited the building sites at Hillfields and Sea Mills. At Sea Mills he gave a short speech and the Lady Mayoress, Emily Twiggs planted an Oak sapling. The tree, known as Addison's Oak still stands today and in 2019 was a runner up in the Woodland Trust tree of the year competition. The land on which Sea Mills is built was purchased by Bristol Corporation from Philip Napier Miles of Kingsweston House and developed on garden city principles, including building at no more than 12 houses per acre. Building began in 1919 and by October 1920 sixteen houses were already occupied. The early houses were built to the standards specified by the Tudor Walters report, including a parlour downstairs, and three bedrooms upstairs. The suburb includes two small shopping areas, one at Westbury Lane and another on Shirehampton Road featuring a symmetrical arrangement of shops around a green bisected by roads. This is known as Sea Mills Square and is now home to the Cafe on the Square and the Sea Mills mini-museum. The Square was also once the site of one of the 13 Trench style police boxes which were erected in Bristol in 1932 to serve the suburbs in lieu of new police stations. During WW2 a large air raid shelter was provided on Sea Mills Square. For this and other information about the residents see the wartime stories on the Sea Mills 100 web site. After WW2 a small estate of prefabricated bungalows were built adjacent to the Portway and also in nearby Coombe Dingle. These have since been demolished. Centenary celebrations In 2019 the Sea Mills 100 project, funded by the National Lottery Heritage Fund and Bristol City Council celebrated the centenary of the 'homes for heroes' municipal housing. Events included a 100 birthday celebration for Addison's Oak and a weekend long heritage trail around the estate. Its lasting legacy is a mini-museum situated in a K6 phone box which was renovated by local volunteers as part of the project. The project also published a book called 'How Lucky I Was' written by people who grew