Just noticed this thread.
I worked for Cressall Manufacturing in Cheston Rd for a short time in the late 60s or early 70s, Only job I ever had where I had to clock in, you got an extra 10/- if you were on time all week.
Great friendly place to work, the work didnt suit me, but have to say that as a company they seemed great.
They made amongst other things, Variable Transformers, some specialist electronics, especially power supplies, and the first ( as far as I know ) light dimmers of the type that are common now' I think one of their electronics design guys - cant remember his name - went on to have the firm that used to spray flock onto cars,
looked great for about 6 months, then they went bald, but great for making old bangers look good.