I took my teaching qualification at Sheffield Uni in the 80's after 20 years as an aerospace engineer. ( I taught CDT).
I had few O levels but several qualifications in engineering, these, I suppose, were the equivalent of a degree.
I researched grants thoroughly and found a discretionary grant that supported myself, wife and 3 children comfortably.
May I suggest that you start by asking about a teaching course at your local Uni and find out if your qualifications are sufficient.
Good luck!