One teacher, in one unnamed school felt uncomfortable about tackling what she considered to be a contentious topic. It was referred to in a paper about teaching history, and in particular about teaching potentially contentious topics and how to best promote historical debate amongst pupils. To in any way characterise that as 'British schools' not teaching the holocaust, is disingenuous.....and lo and behold the 'story' was 'broken' by a right wing tabloid with an axe to grind.
So.....no it didn't happen. British schools weren't and aren't refusing to teach the holocaust.