Naval Gun. A well known local landmark on the north west corner junction of Windmill Lane with Tentelow Lane and Threebridges, <a href="https://en.wikipedia.org/wiki/en:Southall" class="extiw" title="w:en:Southall">Southall</a>, UK. 
<p>Thought  to have been placed there sometime after WWII when the site was occupied  by a local troupe of  Sea Cadets.
</p>
<br>Comment : This is a <a href="https://en.wikipedia.org/wiki/QF_12_pounder_12_cwt_naval_gun" class="extiw" title="en:QF 12 pounder 12 cwt naval gun">QF 12 pounder 12 cwt Mk V gun</a>.
<a href="//commons.wikimedia.org/wiki/User:P.g.champion" title="User:P.g.champion">P.g.champion</a>
CC BY 2.0 uk
<span class="int-own-work" lang="en">Own work</span>