In reply to willgoodrum:
This is a tricky question. I'm old enough to have started climbing before cams were invented, so it would be silly for me to say you shouldn't climb without them. But it's certainly true that cams give you protection possibilities in situations where other gear gives you either no protection, or less reliable protection, or protection that takes longer to place, potentially in strenuous positions. It may also be the case, perhaps less so in Scotland, that a climb will be graded assuming that cams are carried, and a harder grade would be appropriate without. So, while I would still climb without cams, I think I'd prefer to do so only where I had a couple of grades in hand.
Having said that, if I find myself in a situation where I could place both a good nut and a good cam, I'll favour the nut. It will still be where I placed it should I fall off above (whereas a cam will often have "walked" a little) and I still have the cam on my rack to use later in a placement where a nut will not work.
I appreciate that that's not a very helpful answer if you are not in a position to afford to purchase a set of cams.
Martin