One of these?
http://www.alertelectrical.com/uploads/asset_image/2_373.jpg
With that cooker connection unit, I believe you need a single flush back box. Deeper the better.
http://img-europe.electrocomponents.com/images/R7768393-01.jpg
About 50p
http://www.alertelectrical.com/uploads/asset_image/2_373.jpg
With that cooker connection unit, I believe you need a single flush back box. Deeper the better.
http://img-europe.electrocomponents.com/images/R7768393-01.jpg
About 50p