Did a bit a few months back. First haul here,
https://forums.overclockers.co.uk/posts/32872620.
I bought a pin pointer also which can be useful. You have to be an enthusiast i reckon which I just wasn't. Ended up finding it boring, you find 99% junk, bottle tops, tinfoil, nails, bolts, screws, other bits of rusty metal.
I may try again next summer in warmer weather but not in this freezing conditions.
Any questions just ask.