Strange!

I have been passing this random brick structure with a trowel sticking out of the top for a few years now every time I drive up Horsham's busy northern bypass, and I have always wondered what it is, and felt I should one day photograph it, but it is a very busy road, and during the summer it disappears in the undergrowth! However, as you can see the surrounding fields are now cordoned off ready for more redevelopment, so I thought I had better get on and photograph it while I still could and Christmas day with less traffic seemed the best time to do it! 
I have added a close up of the trowel in extras, and also a picture of little Lex opening his presents.