I have just been on another ride, as I'm planning to go for a long ride tomorrow, I better thought I double check this new position... It felt a bit extreme at the moment and I was not feeling 100% right and getting a few mini twinges, so as I did not want to risk it all going wrong tomorrow, I have have tweaked the bike a bit by moving the saddle a tiny bit forward and flipping the stem to the upright position. The bike is now halfway between what he did and what it was like before. Considering it was a massive change from my previous position to his, there is still a noticeable difference, it feels better than before, but not as extreme, so that will hopefully give me time to get used to it, and then I can gradually change it back to Hewitt style when I get used to it a bit more... Still definitely think it was worth going tho!!