Wickes "organic" coated screws

Probably a fluoropolymer.

They usually offer much better protection than any basic plating process. Lots of vehicle manufacturers at the "high end" are now routinely using them in exposed locations.

Dunno, but it does make the nails quite easy to drive home (and perhaps disconcertingly easy to pull out too certainly don't be tempted to get away with ones that are "nearly" long enough)

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "sm_jamieson" saying something like:

Leprechaun snot.

The message from Andy Burns contains these words:

The neighbour's lad asked if I had any nails suitable for holding some bits of gash fencing to a fence post. I gave him some 3" annular nails. A bit later "Guy - how do I get them out again?"

No idea what it is, but I've used them on decking since 2000 with no real sign of corrosion.