oh it happens, but only because its sometimes forced upon those opposing it. ie CHC/Bristow or because it suits them at the time. Unfortunately the TUPE regs are so vague its too easy to pick and choose what you want from them.
But yes, I agree between NS companies who you'd think were appreciative of their workforce, (they arent by the way) TUPE is a joke.
Even the union doesnt want to get involved in it.