Hey there folks,
I can't find me a local supplier of Sphagnum moss, long-fibred or otherwise. Not for want of trying, either! I'm in Devon, in the south-west of the UK.
Orchid Bark I do know where to find; I can probably mix up a respectable medium for me Neps once I've got both. All the decent compost recipes seem to recommend sphagnum at some point, though, and generally as the main ingredient.
Any help appreciated!