Anyhow, here are some pictures.
The copper contacts control the amount of electricity going through the carbon pile which is filled with graphite discs. The copper contacts are positioned by prongs that are moved by putting pressure on the pedal. When the pedal is fully depressed all the contacts are touching thus full capacity of electricity can flow through. The blue arrows mark the approximate path of the electricity.
In order to get the capacitor out, you need to remove the two screws outlined in red. As can be seen above the capacitor doesn't look too healthy.
Once out you will have this:
As you can see above the plastic casing is ruptured and discoloured. I am hoping to get a new capacitor for this machine as it looked very promising before this!
After leaving work this evening we saw the most incredible cloud and I took some photos, one of which is shown below.