Many years ago, someone (from England I think) put together this compendium of the various laws of the various European countries:
http://www.ncmd.co.uk/law.html
Notice how nearly every single one of these, as dire sounding as it/they may be, continues to float words like "archaeological", "historical" and "antiquities". And with origination dates that pre-date detectors (at least for their origin). Thus to keep in compliance, seems to me that you/we are only looking for "modern change" and "modern loss tourist jewelry", etc... right? (I mean, is anyone really standing over your shoulder with a calculator doing the math on age of coins?)
Put it this way: As dire sounding as some of the cited laws on that website are, there seem to be no lack of md'rs in some, or most, of those countries. They are either hunting farmer's lands, with permission (thus outside the laws that apply to public lands), or hunting places where it's ignored (not meant to be applied).
For example: This came up for example, awhile back on a beach hunting forum, where someone who had just returned from Spain, proudly displayed their nice take of gold rings they'd found on a tourist beach there (to the tune of several gold rings per day!). Someone else on the thread "took exception" to their post, saying that detecting in Spain was illegal, and citing this link as their proof. But the hunter had not had any problems, and no one seemed to care

In fact, if I'm not mistaken, there are even dealers in Spain & Italy, etc... (a check of the various manufacturer's websites would verify this). Logic dictates they're selling their machines to
someone, who is ... presumably ..... using them?
So sometimes those "dire sounding" laws that were gathered for purposes of a website like that, apply to federal lands only (or sensitive archaeological sites). Or to things like exporting gold bars, shipwreck salvor stuff, raiding the pyramaids, etc... But for casual hobbyist beach stuff .......when antiquites is not in the issue, well ..... Afterall, you're looking for current losses, eh? Or the wedding ring your wife just lost yesterday, right?
The same confusion has sometimes ensued when someone asks "Is metal detecting in Mexico allowed?" Even though detectors are a common site on tourist beaches in the carribean and mexico, yet someone can seem to find verbage that disallows it
We've all seen the "no one cares, till you ask" psychology on city levels (parks, schools, etc...) right? Well believe it or not, it can occur on the national level too.