Solid Wood Bed Slats/Planks of Wood (Penzance TR18)

Hello,
We are in need of some wooden bed slats or clean planks of wood of similar thickness ie 1.5cm. We need the flat solid wood ones (not the thinner slightly curved ones), We need a mix of the following lengths: 54" or longer and others that are suitable for single bed frames. If you happen to have any we'd be very grateful. Doesn't have to be a full bed set as any will be welcome.
Many thanks for reading.