Anybody experience in the above?

Yes.

It is most likely the seal between the chassis and glass. There were some that were faulty - or deteriorated prematurely. Contact you local dealer, if under warranty it's a quick fix. Other wise it's not an expensive job.

Hi Andrew this isn't a fault but change in atmospheric conditions. We often see this on sets delivered to the store at this time of year when it's cold! If they go straight on the shopfloor and we power them up the condensation appears. The thing to do is put the TV in a warmer environment, then turn on the set on. Use a couple of plastic levers to prise the glass AR screen slightly forward and after 5 minutes it disappears, instead of the plastic levers do it by hand.

with the greatest respect, I probably would have a qualified technician sort this - than risk fracturing the glass prying it in any way.

Dude1:

with the greatest respect, I probably would have a qualified technician sort this

I am in 100% agreement with Dude1 on  this, this gear is toooo expensive to be prying.

You will find that the top edge of the glass is spring loaded and will pull forward without much force. Yes you are right the products cost a lot of money and you should call your dealer to sort it out for you!