I ad an OE spring snap on my Elite a few years back. Not cool.
Original Elite SL springs are notorious for snapping the pigtails off.
Took my 2.6 Elite for an MOT last month, and got the 'beckoning finger' from the MOT man. Fearing the worst, but he just pointed out both rear springs were broken at the bottom pigtail. The car sat ok, and I had been none the wiser. Could have been worse, I suppose. Last time I got a broken spring on another Omega, I only knew about it when I found the broken part of the coil at the top of the drive. Thinking it had fallen from some unlucky persons car driving past, I then looked at it closely, and realising it was GM, my heart began to sink. And it actually was one of mine......

On this occasion, on the 2.6, I know they were the GM originals from new with the LA ident on them, and I don't even tow with this car.
But true, they are notorious for breaking on the first coil of the pigtail....