hi paul,the course itself at edinburgh is well run and thourough as it can be for a short course imo
the instructors will give you after course advice also at no extra cost and i personally found this very helpful as it will be needed
personally if it was me i would do the tiling course to start and spend your first number of years buiding your business,knowledge and skills solely on tiling alone and only taking on tiling work
the reason being there is so much to learn and so many sitautions you will encounter that if you attempt to take on also plumbing which is a completely different trade it would be too much to attempt to learn ata once its hard enough learning the 1st one.
also full bathroom refits you will encounter allsorts of thngs during the rip outs and being able to dot dab,build boxwork that suits the rooms asthetically,rip out and re do whole floors right back to joists sometimes further and also plastering,tanking ,framinig ceilings etc etc the list goes on and on.....my own opinion would be do the tiling course.....learn that 1st till you are damn good then if you want to progress then do further courses
looking back on my start in this line of work there is no way on earth i could have done both courses ,bought all the tools which is vast btw,learned all the skills which therer are many and have been able to turn out a good quality bathroom on my own.
start with family jobs,jobs at home and small projects that dont pose potentially huge problems and give yourself time to do some serious homework at the same time till your confidence builds
there is a good career to be had if you succeed but the work is very hard and very challenging at times for a newcomer,wrk atm is also difficult to find
all the best