We had bought 6.5 inch tongue and groove boards and asked for them to be taken down to 6 inch which basically meant removing the tongue and recutting it with the same dimensions. It's 40£ an hour so if you did the measurements for them it might shave off a few minutes!
We just had 15 machined at ecg joinery. We supplied the materials and it was 80£. Theyre really friendly and helpful