I have an old squash ball you can put under the throttle pedal.
Alternatively try the aftermarket company Vehvac on 01732 868 080. It is the distributor for Rostra Precision Controls (www.rostra.com), America’s largest supplier of cruise controls who also supply General Motors with its systems, which means the technology is well proven.
Vehvac has 14 service centres in Britain and also offers a mobile service. Installation of the system takes a day. Rostra cruise controls are designed to work with the most complex fly-by-wire throttle systems or the most basic cable throttles — Vehvac says there should be no problems installing the system on your Corsa. The only visible change to the car’s cabin is the addition of a control stalk, either on the left or right side of the steering column. The Rostra system costs about £445 installed.