The giveaway here is the tiller steering.
This looks like the remains of an invalid carriage. WW1 saw the first use of high explosive ordnance, and produced thousands of returned servicemen with missing limbs. Custom built invalid carriages gave these blokes mobility. They were either manual powered or used small engines and were geared for walking speed; a forerunner of the modern "mobility scooter".
Doubtless there were major players in this market, buy I suspect that many were locally fabricated to suit teh specific needs of the local returned man.
JFerg
