All qualifications that are industry recognised have to be on the Regulated Qualification Framework (RQF). This means that these courses are completed under supervision, assessed and moderated and independently quality checked.
All qualifications are weighted to a specific number of credits. This means an Award level is usually around 9 credits, Certificates usually around 20 and Diplomas can be around 30 upwards.
The A/ C/ D are not an indication of difficulty (like GCSE and A-Levels), instead it is an indication of the length of study. Generally, add a ‘0’ to the amount of credits a qualification is and that’ll tell you how many hours (roughly) you are likely to spend studying.
The course Level (1,2,3,4 etc) that you see on course information is the determination of difficulty. Level 2 qualifications are around a GCSE old-style A-C grade. Level 3 is around a BTEC/ National Diploma/ AS-Level.
If you do an RQF qualification it will definitely be recognised by industry.
Some distance learning colleges are wishywashy, definitely. I know the one I referred to earlier is legit and works properly.
I work in this field, assessing and moderating teaching assistant qualifications, delivering qualification courses and CPD courses.