I am aware that there are studies which say that Physiotherapy programs are of no value to lumbar back pain. IThat is my experience in the almost 15 years since my injury.
Simon, physiotherapy is a profession not a therapy. If you saw 10 physios, you'd more than likely get 6 different therapy programs, each advanced on different timelines and intensities based on the personality and experience of the therapist.
When reading the literature, it is advisable to read lit reviews so you can appreciate the effect of an intervention on a sample greater than 1. It is also advisable to understand exactly what you are reading and the specific protocol/therapy used. People who get grants to do research usually have to dilute new therapeutic interventions to get ethical approval from standards committees who always err on the side of caution. This can skew research towards ineffective results. And what is called physiotherapy in Dutch studies will be something totally different to Australian or Canadian studies.
Ultimately though, your back is the only experiment you are interested in, and you will come to know what stirs it better than anyone else.
I'd suggest that at this stage, whenever you see health carers, your focus be on asking them to help you understand the anatomy and neuroscience of your back and pain. This can only help you explore various exercise programs and lifestyle adaptations more knowledgeably. The fear of not understanding the cause of your pain when it flares can make the pain worse.
After I got ross river virus and chronic fatigue syndrome, it wasn't too long before I had early onset gout develop. The first few attacks were not diagnosed correctly by the 3-4 5 GPs I saw in that time because I was still in my 20s, when gout is quite rare. The pain was excruciating as it was occurring in larger joints that had been injured in football. On two occasions I had to call an ambulance because I could not walk, and I had many joint effusions tapped and cortisone injections into knees.
What eventually helped me was getting the right diagnosis and the right understanding of the pathophysiology. That led to the right meds and me understanding the right diet and activity adaptations. Even though I still am not 100% compliant with the lifestyle changes, I am doing more of what is right, and that makes a huge diff. Further, I have been able to use my flareups as experiments with ice/heat, hydration, sleep cycle, meds, food, exercise. I know I have a much deeper understanding of my pain and that of many others with inflammatory pain because of the systematic and trial and error approach I've taken.
What I think is hard to come to terms with for many in chronic pain, is that medicine is not a perfect science. The body and mind are way to variable for that, and medicine by no means understands everything about the body. Health professionals have time restrictions on what they can do and convey, and most specialize and fail to see your problem simultaneously from several disciplines. The time pressure also imposes a systems based cooker cutter approach to their therapies, which can compromise the quality and appropriateness of what they do. Most physios are unlikely to give you more than 3 new exercises at a time because most clients are not capable of absorbing more. And yet, truly effective therapy might require a program of 12 exercises carried out in three x 1 hour session 6 days a week. Most people wouldn't follow a regimen like that though.
You can only benefit from self education and systematic logical self observation, and trial and error.
But be wary of marketed products. If they provided significant relief to most sufferers they'd quickly be a universal panacea. There is no conspiracy by health carers to hide stuff that really works. It is however, unfortunate that arrogance, self deception, and narrow mindedness is rife in all health professions, including mine.