Thanks guys for the useful guidance on uncoupling possibilities, I guess I am thinking ahead because today I started making preparations for the baseboard joint and soldering my track.
I decided to go with a tip Dhu Varren expressed back in 2018 where he suggested using his tried and tested method of inserting copper pins into the baseboard, tight to the outsides of the rails and soldering to these. I took the heads of my copper pins and inserted them into the baseboard, l then soldered the rails and made a perfect cut of the track using a brand new track saw, perfect job.