at the end of the day ozz is a genuine bloke at hja, im sure he would put it on a dyno to show the current power, everyone expects everything for nothing im afraid, i bought mine and had a few issues as a car of this caliber will always have, now sorted and running 875 bhp, not the almost 1000 as it was advertised but it really doesnt matter, as long as all the components are there and genuine thats all anyone can ask.
dynos are dead easy to fudge anyways you only need to see a ridiculous high amb temp like a cup of coffee for the probe and the dyno will correct the figure and make it miles higher than it really is, you will know when you drive it if its right.