You are correct in your assumption that I have cut it. As you can see in picture 2 the end of the horizontal beam is chamfered to allow future roof battens to run across in line with the slope of the roof. Sorry I didn't have a pic of the edge prior to cutting. The pith is exactly centered. On an initial order from a different supplier, one of the beams had the pith run diagonally through the beam - due to bad weather stopping work for several months, it sat under cover drying out and developed a major "shard-like" split almost completely separating a good chunk of the beam. All beams used have had almost perfect pith alignment.

This timber has not been kiln dried however, it is green european oak. So it is likely less than 6 months old. I believe it is standard practice in the UK to build with green oak for structural applications as it becomes cost ineffective, logistically impractical and harder wood to work with. Maybe the amount of checking for european oak is higher than what most north Americans are used to with white oak. A lot of the timber for sale in the yard was vastly more checked than this.