Thank you for your comments. In answer to the “I do not give my landline number out & how did they get my number?” the explanation I received from a call centre operator, when challenged on this point, was that the phone number is allegedly dialled at “random” so as to get round the TPS issue. However, it is worth remembering that numbers can be harvested from a number of places especially competitions and application forms. It is always worth ticking the box “do not pass on my details to third parties or sister companies” or something to that effect if you are filling out promotional forms. You can also withdraw your consent at any time from these companies.
Tellows is saying the calls originate from Keith in UK, however the Google map give an address in the US here