Latest telephone scam I have received.

I received a call (not recorded) from someone who said "Hello my name is Simon and I am returning your call about the government's initiative for loft insulation" Well that's a new one on me! Of course I put the phone down but clearly the aim was to get me to say " No I never called you" and he could then go into his spiel about " Oh there must be some mistake, can you give me your name, while you are on the phone let me tell you how we can help etc" It's bad enough getting recorded nuisance calls but this is low level to indicate that you have left a message to be called back. Be aware!