Spondon's full name was Spondon Engineering Ltd and they were a small engineering firm set up by friends Bob Stevenson and Stuart Tiller. They first set up in 1969 as a 2 man outfit in Moor St. in the village of Spondon, near Derby, England, where they both lived. Initially they modified existing motorcycle racing frames for people after proving success on British tracks by Bob.
This developed into making complete chassis and components, firstly using steel tubing and then later on using Alloy extrusions, which is what they are most famous for. To bolster the motorcycle business they also had commercial contracts which included manufacturing trolleys for the national grid that ran along the high voltage cables making up the country's electrical distribution system, allowing cables to be replaced.
They made the chassis for the rotary engined Norton F1's when they were in production and also had contracts for chassis development for various other motorcycle firms over the years.
Unfortunately, after Bob retired they became swallowed up by the farce that was Norton Motorcycles after Stuart Garner bought Bob's half of the business. Spondon are no longer trading but their work is still held in high regard even now.