the current situation is that the boundary of the Somerset Levels and Moors is now relation 278627879.
At the time of writing this relation has the following ways as members: 207244544 207249332 54644027 207249333 207746811 207746818 207358221 207746813 190914419 29417895 207244546 153044009 153044010 72554425 148075256 207244538 207244543 Some of these were existing features (rivers) that I used as a boundary.
I also have (for the purposes of rendering) two ways tagged as natural=moor 208638587 - Western and Southern segment 210866783 - Middle segment
As a result of Potlatch misbehaving when trying to save an overlong way I also have the following ways created in error that probably ought to be deleted: 207882847 207881808 207881814 207882846