Take the track out towards Fernacre farm (strangely not named on OS maps...even though it is one of the biggest farms on the moor!). You can only drive so far before a sign says private road. From there it is a walk in...open access..can't stop you.
Don't bother too much looking for Louden circle (on other side of track) very unimpressive...the long cairn is also nearby...north of track...bugger to find though!
See you in March?
Mr H