I received  a phone call from this number today, although it doesn't help I just picked up the phone and hung up. Obviously a call centre, no doubt. I am on the Do Not Call Register though.

we keep getting phone calls from this number.  we will soon report it to the authorities

who call me ?

This number has called a couple of times and no one is on the other end of the line.  Called back and got a fax machine.  Really pissed as i have a baby who goes down to sleep at around the same time this number calls.

Oh just to add, when things work normally the mother-in-laws calls show up as 'anonymous' and on less frequent occasions as this number (02) 8011 1215). Wife said that at times she has answered and no one was on the other end, which again fits in with what some of you have also said.

Had a call from this number so I called it back and it was a fax machine.