The sonographers in our health authority won't tell you the gender. As it's not a 'shall we/shan't we' while you're in for the 20 week scan, I think it removes the temptation and because you have to go to the effort and expense of booking (and paying!) for a private scan, then it's only those who have a burning desire to find out who do it, so less chance of regrets I would presume.
I thought that they didn't tell you because they had been sued for getting it wrong in the past but apparently it's because they found that some people would invent reasons to try and wangle an extra scan after the 20 week one (e.g. claiming to be bleeding) to 'make sure' the baby was 'still a boy/girl'.
Unfortunately it's more common than you would think and they have found that since the stopped scanning for gender, it's saved an awful lot of NHS time and resources.My friend's a sonographer and they are currently debating whether to start offering gender scans again but it's unlikely because they are a very busy department as it is.
Lelarose, I think the accuracy rate is officially 60% but i don't know of anyone who has personal experience of them getting it wrong.
FWIW, we didn't find out the gender though I did convince myself(and everybody else, including DH) that I was having a boy and on the day found out I was ....wrong!
I think it definitely added to the whole experience for us as it was a huge surprise, though I did keep referring to DD as "he"(slip of the tongue after so long!)in the postnatal ward, prompting one of the MWs to check that I did really know and understand that DD was a girl...which was quite amusing!