So, the conclusion.
The switch collapse issue as can be found on the internet was not the problem. I have not seen the hazard switch that the American spec cars have, but my suspicion is that it may look the same, but actually be slightly different - I do not know, but the inards of my switch had not collapsed as can been seen on the various references to this fault when googling. These posts suggest that a Land Rover Discovery switch can be swapped out with the OEM Lotus switch, but I think that the LR version would not suit the connector plug ( I bought a LR switch but was too timid to try it )
The original switch was fine, the brand new replacement wasn't(!), but the actual problem was the tiny 1.2v lamp ( bulb ) in the hazard switch itself.
All I can say is that I would have paid a small fortune to resolve the matter, it was a complete wind up, pretty much all I could think about.
Special thanks to Dr Doom who gave the game away - It appears that the hazard switch is like a hub in a Series 3 Esprit as well as his Series 2, at one point the windscreen wipers were literally blinking ( I kid you not ) across the glass, the ignition wasn't even on when that occurred. I have no idea how you can wire anything up to make that happen and then simply fix everything by popping in a new 1.2V bulb, but that is what I have just seen with my own eyes!
So, for anyone who is trawling the internet looking for a solution as to why your hazard lights on your 1987 series 3 Giugario Esprit Turbo( that mouthful is just for the google bots ) is not working, it could all be due to the tiny 1.2V lamp that flashes on the switch itself to tell you that the hazards are on ( or not as my case was ). It is not easy to find, but disconnect the switch from the loom connector and there it is, smaller than the tip on a marker pen, you can get ten for a fiver.
In conclusion, this car is drop dead gorgeous, draws admiring glances, whilst also liking a drink and managing to skip about like something half its age. It also stubborn, complicated, illogical and frustrating - It's a marriage made in heaven