top end rattle

[damojenks]

Guys i have yet even more trouble with my car and no idea whats happened. I had the engine work done and car was fine for a couple of days, then the auxiliary belt slipped so put a brand new one on today along with a new tensioner as well, got home from the garage today after getting it all done, went to the shops ten mins later and there is a bad tapping noise when car goes over 1500 revs. took the rocker cover off and the cam belt is running true no play in cam pullys, cant see any signs of wear on them either plenty of oil in it, just got changed yesterday. could this be my lash adjusters making a noise or could it be worse? quite a loud noise but defo top end noise, car was just run in and was done properley too.
Please help guys, i have already spent £3000 on my car in last 3 1/2 months and only had 4 days use out of it and they have been in the last 2 weeks.