I thought it would look really 'crappy' but actually not so bad! (I must admit a strip of black correx would be even neater - if I can find some) But the pipe insulators do the job...
As I drove home tonight I used Hybrid Assistant to keep an eye on the temperatures - both in town and on the dual-carriageway. Even with the greatly reduced air through the grill, ( the lower grill is almost totally blocked off) the engine temp can drop very quickly if you slow down, or start using the heater.
Anyone else doing this in the colder months? It does puzzle me that a hybrid would not come as standard with a radiator blind, or shutters. Also, why on earth are they not fitted with LED lights as a matter of course???