Can't speak for LGW or the controller concerned but if I've followed all the procedures correctly but it just hasn't worked out right I don't give a pilot report that ther'll be an MOR any thought.
In my experience, and granted it's only happened half a dozen times over 20 years, the pilot usually doesn't mention it to the controller either by RT or phone. There's a balance to be found. As sid says, it can be an unnecessary distraction to the controller to mention it on the RT but, equally, if the controller has to record what happened from his/her perspective it's far easier to do it on the day rather than a month or so later (which is how long it seems to take to filter back to the unit).