Some calculations for another member who asked about postage :
The boards weigh approx 125g each.
Packaging - around the bare minimum to protect the boards in their full size is 250g
So the price of postage alone is :
2 boards + Packaging = 500g = £3.15 postage via 2nd Class recorded, £3.65 via 1st Class recorded
4 boards + Packaging = 750g = £3.15 postage via 2nd Class recorded, £3.65 via 1st Class recorded
6 boards + Packaging = 1Kg = £4.45 2nd rec and £5.25 1'st rec
10 boards + Packaging = 1.5Kg = £7.45 1'st rec
I could get 3 boards cut in half into a jiffy bag and sent as a Large Letter for £2.85 First Class Recorded (30p for the Jiffy bag !)