Someone posted a week or so ago that halfords was selling carbon posts for cheap? I went into my local halfrauds (big one) and asked and they said they had never sold/stocked a carbon seatpost?

That particular store might not have, but Halfords do in general. (Well at least I have seen it in Chelmsford, and Salisbury 🙂 )

Do a search on ebay for Outland carbon posts, they are OK for the money, but quite bit more £ than the thread on Halfords posts was on about, but the buy who started that thread had found one in the bargain bin.