Have now opened it. Started off by joining the two 700mm tracks together, laid it on the kitchen worktop, one track flat on the worktop, far end of other track about 10mm in the air, no way this will work without clamps. The joining bar is not flat/straight. Also there is only one joining bar so the tracks look like they could twist out of alignment. The tracks do not line up perfectly, bit of a lip.
I then attached the saw and adjusted it for a tight fit, bit fiddly to get it right. Slid nicely along the first track, got to the joint and it jammed. Backed the adjusters off a bit and it worked but obviously now a bit of slack.
I could do a bit of fine tuning on the joining bar and probably get it better, but it would still have only one bar and be a bit delicate, I can see the track having to be stored as two pieces.
It is unfortunate that the 1.4m of track does not come as one length especially as it is made in a continuous length and cut to size. No doubt all to do with packaging and transportation.
I already have a home made track for my circular saw. I can see that this saw will need a new track for me to be happy with it, possibly a pair of evolution rails.
Would appreciate comments from anyone who has used the parkside tracks.