Thanks for all the comments, I guess at the end of the day it is 'horses for courses' on which system you use (or decide to get)
I have used AutoCAD for some time for work, but this is generally way beyond the pocket of the 'home user' . . but I have found that TC does seem to emulate a lot of the UI deployed in AutoCAD, so the learning curve has (so far) been not too steep.
I manged to get TC Designer 2019 for only £38 in the end, so a reasonible dicount, I have subsequently 'upgraded' this to TC 2019 Deluxe, this is the full 3D version, in addition to the conventional 3D capability it has a lot of other functionality that the 2D version lacks.
I did this through the U.S site, so paid a discounted price in dollars, and could then take advantage of a fair exchange rate giving more discount
So the total cost to me has been just under £100 for the TC Deluxe which is widely advertised on UK sites for around 50% more.
But I fully appreciate it's not a CAD program that suits everyones needs.
Kind regards,
Steve N