Pft! Well its not the battery although the Peugeot mechanics money was on that.
The good news is that it probably isn't the emission control gizmo as that warning light will stay illuminated simply because the engine isn't running yet.
My guess now is the starter motor because having stood and listened with the bonnet up tonight it does definitely click when the ignition is turned, but nothing else - hit it with a hammer for good luck but that did naff all to fix it.
So its still at the hotel, but the good news is that I called at the Peugeot dealer this lunchtime and they have a car in there that I'd quite fancy, so I'm currently twisting the arm of the salesman who has to date sold me about ten cars, to get me out of this motionless car into the one on his forecourt - and of course they are desperate to sell at the moment, watch this space, tomorrow is when he has to come up with a deal for me.
So tomorrow its back on the bike for me.