Lol, when I look at photos I agree Karin! But when the dentist showed what happens when I put some tension on the reins, the bit in the last picture straightens out to be about 1/2 an inch out of either side of his mouth. He also showed that when you put tension on one rein, the lozenge which is supposed to sit in the centre of his mouth, ended up very near the corner of his mouth....not good at all. He suggested that the current bit I have is sitting too low in his mouth and its too big.
I'm thinking maybe, depending on the type of bit, that around 6.25" might be better. I'm wondering if the 6" pictured is just a bit too neat. Flipo, seemed unfazed. Am going to try out the 6" in the morning I think. More fool me, as I will have no brakes what so ever, but unless he spooks, it will give me a good indication of how comfortable he is in this size.