I said Nearly...
WB straw is £102 ton
WB grain is what £120 ton?
( so not much difference )
Your maths is still wrong GUTH. Winter barley grain yield of 3 t/acre. Straw yield 1.5 -2 t/acre. £12/t to bale and load, then £30/t to haul it to the West Country. Not such a money spinner for the arable farmer when the swaths get rained on week after week whilst waiting for the baler to run up, drop brome/blackgrass seeds off then the lorries & drags get stuck in the fields hauling it out, requiring remedial subsoiler work. Knock 0.2 t/acre off the following osr yield for the 3 week drilling delay.
Ok, using winter barley is a bad example as time & usually the weather is on side but for spring barley & wheat it is very different.