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Hopefully i can help..
Turbo faults manifest in lots of ways depending on the nature of the problem with it..normally the most common is lack of proper oil/filter changes that often cause problems..the other is oil starvation in regards ***** ***** turbo not getting a proper supply of oil feed in turn this causes the bearings on the turbine/compressor shaft to wear and thus causing the shaft to become unbalanced and then you get the unusual noises.grating/whistle etc..easy way to know is to get the intake tube on the compressor side of the turbo off..and then feel by hand the shaft inside play or look of oil pooling inside..if there is then the turbo often needs replaced..Also in some case you may find a lag in turbo kicking in/blue smoke if oil is getting past the seals / black smoke if the wastegate is sticking..again that something that needs to be checked out..Also not forgetting to check all intake/intercooler hoses obvious signs of tears/splits etc.so that has to be checked out too..but as above thats normally the most common problems one of which being due to oil quaility or lack of oil lubircation reaching the turbo itself..I do hope this helps
Dear Robert - many thanks for your reply, which has been very useful.
I shall have the garage look into your recommendations.