A recent Asian sounding but 0203 number asked if I was "Mr Smith?" He got quite perky when I said yes and then gave him my first name as Eric. What followed was a 'survey' to find out my personal preferences. All very polite and orderly. (Btw...I'm not Eric Smith)
Sits back and waits......
About a week later calls from Guys Hospital, Sanderson Blinds, Woodland Trust, Talk Talk et al, and all asking to speak to Mr Eric Smith. When it's pointed out to them that they've obtained my phone number from a Malaysian call center and I'm not who they think I am and they're going to be reported to the Information Commisioner some of them got quite shirty and hung-up. As if it's OK for them to invade your privacy via the back door route.
For the last month or so we've been working the BT 8500 phone with Call Guardian and it's fantastic.