Thanks for the quick reply

. I'm familiar with put options et al (I don't know why I didn't think of it at the time of writing :/).
The reason I came up with this was because I was speaking to a former trader yesterday and he was speaking about losing more than your initial investment when dealing with spread betting.
He must have been speaking of being leveraged in said case, without having insurance against going down more than one's initial investment. It's just the way he said it, as if it were common to be vulnerable to that sort of exposure.