Rio, check these out:

http://www.gecareers.com/GECAREERS/h..._in_engin.html

I found it through a job offered by VetcoGray http://www.vetcogray.com in Aberdeenshire for a mechanical engineer (oil and gas not your field but still, I'm sure the GE people have other subsidiaries, etc. in different fields?)

Find other companies looking through these ads:

http://www.ukjobsnet.co.uk/job-searc...-scotland.html

Then send them resumes or letters inquiring about summer jobs? If they're US companies, go to their site and look for things like you did for Ford (and I found for GE).