I recently put up a couple of standard 2m fence panels; they stand at the edge of a reasonably substantial drop though, so it's really important they don't get pushed over (TBH I think I now regret not having erected steel railings instead).
I've decided that it wouldn't be a bad idea to attach a length of mild steel to the reverse (hidden) side of the fence, just below the top; ie screw a 4m length to the three fence posts, so it would act as a rail and prevent the fence panel from breaking and falling over the edge if someone fell really heavily against it.
Question - what would be best to use: angle iron or solid steel bar of comparable substance/cost - eg, say 20x20x3mm angle iron vs 12mm solid bar? (I favour the angle iron in the sense it will be easier to get through with my hand drill!)
Also - where, as a civilian, am I best going to buy this sort of stuff? I don't normally 'do' metal; the last time I bought some steel years ago I went to a local steel stockholder and got royally ripped off I reckon...