Although the average age of sex change surgery is 42, most children will have realised they are transgendered around the age of six or seven.

A primary school of 300 children may have as many as three transgendered children on roll – although they may not be “out”. A large secondary even more. Others will have a transgendered parent or close relative.

About 1 per cent of the UK population is transgendered; roughly the population of Sheffield and this is continuing to grow