At least they called back, our elderly nieghbours are very nervous of crime and we live in a very safe area where "touch wood" there has never been any problems of any kind.
If you put up some gates, connect a switch which switched on the lights and sounds chime in the house. You can use wireless battery powered senders for this.
Must give your grandad a feeling of security though, just a shame it's necessary. A friend of mine has been working non stop on the Underground bomb CCTV footage since the bombs went off, it's amazing how much info they have got from it.
By the way why are you up so early, our little boy has been ill with a bad cold so he's been up really early every day.