I find all this stuff quite upsetting. Both my Mother in law and elderly Aunt have been subjected to doorstop thefts too. One had someone asking for money/befriending her and then he asked to use her loo and she let him in. The other had a man 'from the council' want money for some over hanging branches. It is horrible and these calls are just another guise

Backseat Driver, Former PM Tony Blair Reckons The Triple-Lock...
at that point I felt scared and put the phone down 
