Microwave turntable support (Summertown OX2)

As per the photos. I'm afraid I don't know what brand/model of microwave this came from. It measures approx 11.3cm from the centre to the end of the white bit on the arm. The centre bit is in the shape of a cross and has the letter 'B' marked into the plastic. It is old, but I can't see any reason why it wouldn't still work! Collect from either Kidlington or Summertown.