We used to go a lot and find the odd bit of rusty metal around old castles. The best was the beach where you'd find lots of coins you could actually spend. And the odd Coke can.

We once found a something huge under the lawn which turned out to be a rusty bike frame after we'd dug it all up.

At that point we realised buried treasure was probably a pipe dream.

I dug three feet deep before I remembered my shoes had steel toecaps.

in the form of handcuffs.

About 30 years ago my dad was into metal detecting in a big way, even subscribing to a monthly metal detecting magazine.

He went through three models of detector, the first being a somewhat basic one from a local electrical shop, whilst the next was a fairly expensive model acquired after seeing an advert in the magazine I mentioned above. That model claimed to be able to ignore silver-foil and other worthless junk, and featured a good number of knobs on the main panel. His third model looked similar to the second, but featured a couple more knobs, a meter and some extra buttons, and for that privilege cost over twice the price of the previous one, whilst doing little more. Both ate batteries, strange 9V things that were somewhat difficult to locate, larger than a PP3 but smaller than the ones that went in our radio.

My dad used to pop out most weekends, digging up all over the local area. Most of his finds were old copper coins, which due to being buried were somewhat corroded and therefore worthless. He also found some silver coins, the odd ring, and a few sundry other things, such as a token for the local cocoa house. Many a holiday was ruined whist my dad went digging up a field or beach somewhere, or went off hunting for a shop that stocked those strange batteries.

Google: "Black Sabbath".
There you go, sorted.

it found Patrick's and Uncle Wheaty's record collections.

Will normally feature a couple of chaps wiggling metal detectors around.

No reports yet of Portsmouth's lost bullion cache being discovered on turd-infested shingle strip.