Waxing course advice

I am L2 VTCT qualified and absolutely love everything beauty related and done multiple training courses but i'm not working in beauty at the moment (always in and out due to finances and being scared to leave a stable job to pursue my dream!)
I want to get back into it again and have been thinking about L3 but but I'm money and time restricted. so i'm thinking the best is to become more qualified in waxing, intimate and so on. which i think i can offer in my spare time and hope i get busy enough to go part time etc. and then introduce more beauty into my offering. .
I would like advice on training courses and what you liked about your suggested ones. ive heard of Elite, waxperts, Kim lawless etc. (open to other courses) but I would really appreciate some honest opinions and advice, before booking.
note i'm in London. TIA