Hi thevetchlings, 

You've converted the tag landuse=meadow to landuse=farming. The landuse=farming means the land is used for growing arable crops. That is clearly not the case. This area, and nearly all of the Dartmoor area only have natural=meadow, meadow=pasture.

I personally strongly dislike the tagging OSM has ended up with for pasture, but thats what we have. 

You're also introducing the tag natural=grassland, grassland=moor. The usage of moor in the UK appears primarily by you. Unless there is community aggreement, we have to stick to heath.

Thanks,
Jass