Thanks BB for the quick reply.
Yes it is a bit of a predicament. Create a great everyday mower or a something I'm scared to use. Actually it's not that bad. I can't see why I can't have both!

I hadn't noticed the bedknife on the twin rail. It measures 66mm vs 52mm on the single rail. Win 4 me! You mentioned the later reel was the better one. Is this because it is not damaged or was there different designs? The blades measures 22.5mm newer vs 23.5mm older. How much meat does a new blade have and how do you know when they are past their service life? (Sorry about the questions - I am only up to page ten on the topic list.....)

I just checked the twin rails. Without taking off the motor (which I will do tomorrow) they appear fine.
Cheers Mark