@Andyflow:
I did not presume that the sonographer was paid the 50 pounds, nor did I mean that it is an easy job, nor do I think that a scan is only for sexing. It is outragious that there are people in this world who huff and puff because they can't see the sex of the baby. That is sad. Or even worse, that they sigh at 'the wrong sex'. I must admit if I were expecting a boy as a first, I would be, let's call it very very very mildly disappointed, because I would certainly want a girl, but I would not take it out on anyone and certainly not call it 'the wrong sex'. I realise that your responsibility lies with anomalies first and that sometimes, indeed, the sex isn't visible. That is not the issue though.
However, I also believe that there are some, sorry sh*te, sonographers who are not concerned with any one of their customers. At least one could ask for basic politeness and some info. I understand that this is depending on the trust though. So if your colleagues are fine, polite and nice, then that's great, but I have heard other stories.
Like that one sonographer, according to this mumsnet member, who literally took 5 seconds to not see a heartbeat and basically told the mother that there was no baby and then the NHS didn't even want to do a second scan to confirm. Baby was fine, it turned out. Yet, the NHS, after the mother knew that baby was fine due to a private scan, was still pushing for a termination. I find that, sorry, clueless. It can be down to rushing, to guidelines and everything, but it is not something you play with.
The point is that paying 50 pounds only for maybe five minutes extra in extremis is a bit steep.