I looked at doing this walk, but was put off by the cost of baggage transfer (I'm not tough enough to carry it by myself!).
There is no baggage transfer company, but you can arrange for a local taxi to move your bag, however it costs about a pound a mile, so most days would be 20-25pounds.
Several of the guided walk companies include the bag transfer in the accom fee if you book through them, the B&B owners generally moving driving your bag to the next stop. This wasn't an option for me as I was going to be camping.
Its a pity because it looks like an interesting walk !!