I pulled this out of the sub soil exposed beneath an eroded field boundary junction hedgebank along near the coastal path.
No interactions present.
It looks more like part of a crab's claw than a tooth.
Agree with Steve, maybe a spider crab pincer.
It's not a tooth because it is hollow. If you look carefully it has a row of regular bumps along the inner edge, no British mammal has such a feature on either its teeth or claws. This is definitely a crab's claw but which one?
Try moving this to the invertebrate section of iSPot there are marine experts on there who may be able to give you a better idea. Open the original observation and change the category from mammals to invertebrates.
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Lat/Lng: 50.3, -4.3
OS grid ref: SX4248