I'm glad your going to do well with your oaks, and by the sounds of it you've got a bulletproof plan. This time next year Rodders...
I make my money by having quite a bit of experience at what I do, trust me, it's bloody hard work and the money isn't easy. Everything I have is invested in what I do, including most of my adult life spent looking for ways to improve on quality and efficiency. Your welcome to come and spend a day splitting stakes with the lads if you think it's easy.
The forestry commission publishes the results of their timber sales on the website, and Confor have the market report in their magazine, it's what I base my prices on. If you have a customer willing to pay over the odds for your product because it's local then that is a good thing.
In my experience oak can be a fast way to lose money, your ok because you won't be paying for it and I'm guessing will be doing all the work in house. Big timber is the biggest gamble of all. It needs to be felled well or risk wasting a big proportion of the log, then the kit to bring it out needs to be upto scratch (oak is hard on kit~), even with an experienced miller we get a high volume of waste, shake or rot. Theres upkeep of the mill, blades, downtime, transport. Then factor in holding stock while it dries plus a certain amount of waste from splitting. That's all before you've spent time and money on selling it and a percentage which will sit in the yard for years going grey because it just wont sell.
What I'm trying to get accross is contractors are not ripping off woodland owners to make a fast buck, bringing trees from standing to end market is a skilled job and involves risk, which is why the difference between sawn wood and standing timber is so high.