Thank you for all your input peeps.
I think the main issue for me would probably be the lack of knowledge in up to date technologies in a large scale environment - this is where my downfall would be; if anything, I guess doing a professional certificate would not only help me enhance my own chances of doing something I enjoy but also give me the confidence to marry my old experiences with new teachings and go into a job knowing what I'm doing.
Of course, this is all theoretical at the moment. I have 3 businesses to run and a payroll of 18 lasses to look after - first and foremost. I guess studying something I also enjoy will break the daily rigours and stresses of my current lifestyle - and also help me plan my future a little better.