William Henry Thomas (1858 – 1923) was the founder of the Middlesbrough and District Betterment and Open Spaces Association, a small rest garden on Acklam Road houses the memorial.
Considering the subject matter, its rather sad that part of the park has recently been lost to roundabout for new housing estate and the general state of disrepair of the steps leading up to the monument.
However I found some council meeting minutes which say the developer is to spend £500,000 on upgrading the public open space, hopefully those will include the park and memorial.