The letter
Dear landowner,
I'm a metal detectorist, and I'm writing to ask whether you would let me detect on your land.
I detect responsibly. I fill in every hole and leave the ground as I found it, close gates, keep clear of crops and livestock, and follow any conditions you'd like to set.
I'd suggest we share the value of any finds, 50% to you, and I'm happy to put that in writing. I keep findspots private.
I'd be glad to show you what I find, and to give you a list at the end of each season. If you're happy to give permission, I've included a short agreement we can both sign.
Thank you for considering it.
Yours sincerely,
Your name