I too have a delay my new Clio.
I ordered it on the 14/03/2011 for a 6-8 weeks delivery window. On checking with the dealership last week (because I had not received any details on the progress of my vehicle), I discovered that my car had not yet been allocated and therefore manufacture has not yet started on it due to japanese parts problems+there were many other customers in the same position as me also waiting!
This was the first I knew of this impending issue and if I hadn't raised my concerns then I probably would be no wiser to this ...

!
I promptly spoke to Renault UK to get the full low-down on this. They advised that there was a delay with my vehicle, but this is very dependant on what options your vehicle has. Mine has bluetooth and Satnav which is what appears to be holding up the build (because these parts sourced from Japan).
I cannot fault the customer serices people at Renault UK. They could not comfirm a definate date but have advised they will keep me updated on a weekly basis and would notify me immediately once a vehicle has been assigned.