I was trained in 1975 here in Italy, with FIPS/CMAS. The course was 6+ months long, and it did include EVERYTHING: savage, deep diving with deco and twin cylinders plus pony, it was standard to use tow fully independent regs and NO BCD. We were also trained using pure oxygen rebreathers (actually we used them more than compressed air scuba systems).
A lot of exercises with no equipment at all, including 25 meters of underwater frog swimming holding your breath. A lot of exercises with just fins, mask and snorkel, including reaching 15 meters and resurfacing, with the help of a big weight for speeding up the descent.
The theory-pool part did include multistage deco, using of mixtures (no Nitrox at the time), resuscitation techniques, human physiology, advanced breathing techniques, advanced equalization techniques (including Frenzel and Marcante-Odaglia), and introduction to deep free diving.
Despite all of this, the final certification was allowing just for 15 meters maximum depth and no deco.
The following years i also followed the coruse of level II and III. The latter gave me certification for a maximum depth of 50m, with multistage deco, which is something now considered "technical". I was also certified for pure oxygen rebreathers (ARO) down to 10 meters.
These limits are well deeper than what is actually permitted to rec divers.
the training method was very hard, military-style. Students had to obey entirely to the instructor, carrying his equipment and doing any kind of "corve'" when required, including washing the floor of the lab where the scrubbers were refilled, or taking care of the compressor while filling the cylinders.
We started in 45, only 10 of them were certified at the end of the first of course. of these ten, only I proceeded to levels II and III in the following years, as for most people the training received in the first course was fully enough for all their needs.
That level of training was truly excessive. years later, when i was already an instructur, I had my one-year mandatory military service as a firefighter.
In Italy firefigheters are a paramilitary corp, with a central training center in Rome. The training lasts 3.5 months. As I was already an instructor, I had the opportunity to help during the training course for scuba diving (there is a special group of scuba-divers in the Firefighters Corp).
The method employed there was substantially similar to my forst course. But the coruse was shorter, there was no rebreather part, and the requirement were generally lower.
Hence the standard of my fiorst course was HIGHER than the staandard of a para-military course!
The same happened to my wife: she had a very similar path tpo my one, simply she started on year later.
And also she, when instructor, had the possibility to compare her training with the training of another Italian military corp, Carabinieri (they are fully military). Also in her case resulted that she had a longer and deeper training than the specialised corp of Scuba Carabinieri.
The only military corp doing substantially the same training as in these old FIPS/CMAS course was COMSUBIN, a group of the Italian navy which can be considered similar to US NAVY SEALs. Thei also have a 6-months training, and are trained to use the oxygen rebreathers.
All that said, the result is: was such a long, difficult and expensive training required for becoming a scuba diver? Of course NO.
In fact, in subsequent years, the FIPS didactic program was reduced significantly, realigning it with agencies of other countries operating under the CMAS affiliation, such as BSAC.
Nowadays these courses are much shorter and lighter, still being more "serious" and providing wider range of knowledge and skills than the corresponding US-based agencies (such as PADI, NAUI, etc.).
So the answer for the original poster, and my recommendation, as he is based in UK, is to go with BSAC, obtaining a CMAS certification. This provides a much solid base than a minimal OW course with PADI or the like.
Still, the PADI method creates very good divers, but this requires a number of subsequent courses and a lot of so-called "specialisations". Which in the end take more time and cost much more money than a single, solid and properly long first course.
It must also be said that we are not all equal. The PADI approach works better with a certain type of people, who simply cannot learn "everything in a batch", and they need to assess any new skill with some practice, before moving to the next.
So I do not think that the PADI approach is wrong, nor dangerous. For some people it can even be better...