just been informed by one of my electricians..  the deta screwless (slimline range) the embossed brown & blue circles around the cable entry points,, is reversed  L blue.. N..brown.. yes it is correctly marked but when the fitting is being connected.. the writing is facing the wall,, the coloured apertures are prominent and thats where you will bung your cables.. just a heads up in case your using the same.. 2 electricians wasting 3 hours taking them all back off again...  hell.. its only money..

gary