2010 Octavia TDi sluggish starting when engine is warm

[cslwannabe]

As above - my 2.0 TDi PD starts immediately on the turn of the key when cold, but when the engine is warm it takes several seconds to start and I begin to wonder if its actually going to even start. Any ideas?

I had a similar problem with my BMW 330Ci some years ago and it turned out to be a crankshaft sensor, although even after starting the revs would hunt and it wouldn't be its usually silky smooth self for a little while after, whereas apart from taking what seems like an age to start the Octavia doesn't seem to doing anything else unusual.

Thanks in advance.