I wouldn`t think your rear bump stops missing would cause creaks,more like a dry bush,what did they do to repair your emissions for the mot?An injector can cost up to £400 now and there are four of them so you see how costs can climb quite steeply,other than that it is hard to say if you have been done without more information.
cdc
January 2013
howtomendit.com for free repair help, information and advice.
