ho ho... I feel sorry for the folk behind me...
Great encouragement Mad Doug, thanks! Really looking forward to it. Just need to work out the logistics now - how to get there, i.e. use my own transport or pay PfS to get me there...!
By September you will be cycling there & back easily

More seriously, if you keep your current mileage up, you'll be fine! Plenty of people do it who have never ridden further than 5-10 miles before. Of course, some will be more knackered than others afterwards. The buzz from such a mass event and the cakes supplied along the way help, too

Due to the sheer number of cyclists on the roads, you won't be able to set out too fast - especially as the less experienced ones are all over the place, so you need to keep your eyes open ...
Try a search on CC for the PfS, this is where CC Ecosse was born - 3 years ago? There are annual PfS threads with photos, tales and youtube, quite entertaining ...
T