Right, I took my tensioner to harvey and he confimred that it was fooked. I bought a new one and put it on. However, there is still a whirring noise. I am pretty certain it was coming from the camshaft area so I took the rocker off and took the exhuast cam out to take a look at the bearings. I slipped the bearings off, they weren't spinning very freely but after a clean up they are now spinning a bit better. There is a little bit of play in them aswell. I haven't checked the inlet cam, but I am guessing it will be pretty much the same as both camshafts seem to making a similar noise. Any advice would be appreciated, does it sound like these bearings have had it. If so, how much are replacements?