FSSL - Ferranti Subsea Systems Ltd. They were taken over by Kvaerner in the 1990's, and my younger brother worked for both, and had many boilersuits from both, for working off-shore on oil rigs in the North Sea. He persuaded me to take a couple of them, from his thinner days, and they fitted better than any I'd previously bought, with the added bonus of having our surname sewn on the front.
You're so missed Cam, and this and the other one are regular reminders of older times.
Think my head was numbed a bit too much cycling over the big bridge last night in that Baltic breeze. The natural cover up there is now somewhat sparse. Mild headache tonight.