puff of blue smoke

my defender 200 tdi lets out a puff of blue smoke when on tickover and blipping the accelerator, ive changed the valve stem seals, could it be anything to do with the crankcase breather,or turbo seals maybe, if its the turbo could i change the seals myself or is it best left to a specialist.
thanks for any replies

if it sounds like a dentist drill when you rev its the turbo.

not noticed any sound like that, any ideas what it could be ? have noticed very small amount of oil in the turbo inlet pipe and also outlet pipe on the intercooler but only a couple of drops, when the turbo oil seals go do they just let go big time or is it gradual

some oil from turbo is normal, how well does it start with out heater plugs

it starts really well just a flik of the key

Might be piston rings if it smokes blue even when at operating temperature