Well the barometer sensor only seemed to solve the power loss problem for about 2 days and now the power loss is worse than ever. Still getting plumes of blue smoke pouring out the exhausts, so its back with Vauxhall today. Spoke to the head mechanic and they are going to change the oil as they have spoken to vauxhall uk and they sem to think the 5w 30 may be too thin, gonna go with with 10w 40. I really cant see this is gonna be the root cause of the problem, other than that the heads coming off have a look. Tbh its really starting to get me down, i've chucked £500 at it so far with no noticeable improvement.