My dr colleagues (I’m a lawyer in a large public sector org) tell me it’s the BMA blocking it. Sorry don’t have source. The BMA is an incredibly powerful union and govt officials terrified of them!
This is nonsense.
The BMA is concerned with ensuring that there are jobs for doctors. It opposes moves to promote competition by increasing the number of medical graduates without increasing the number of training posts for them. It is entirely unfair to put someone through 5-6 years of medical school if a proportion of them are then unable to get jobs as doctors and would have been better off doing a 3-year degree. In any case, the BMA doesn't make policy; it expresses opinions on behalf of doctors. It doesn't have any power to "block" anything. And the stuff about government officials being "terrified" of the BMA is utter horseshit.
(Disclaimer: I am not a doctor. I do work in a medical school.)
The main obstacles to training more doctors are: (a) the cost to the NHS (approx £200,000 per graduate); (b) the sclerotic approach of medical schools & teaching hospitals to clinical placements, which are inefficient and put tighter limits on placement capacity than are necessary; (c) the GMC's outcomes for graduates, which require too many specific skills to have been demonstrated at undergraduate level, when opportunities to practise them are often scarce, while not setting a high enough bar for generic skills; (d) the BMA's issue of bottlenecks in postgraduate training programmes (these are currently being addressed, although it remains to be seen whether anything genuinely changes); (e) the "leaky bucket" of junior doctors' emigrating, taking career breaks and not returning, and working part-time (especially in general practice) because of the unreasonable workload.
Some of the measures put in place to try to support the over-stretched medical workforce have made the situation worse to some extent. For example, training physician associates to take on part of the role of doctors places increased pressure on clinical placement capacity as these students also require extensive placements in the same settings. The proposed apprenticeship route to train more doctors risks causing shortages in other healthcare professions.
It seems to me there needs to be an increased number of places on accelerated (e.g. graduate-entry) medical education/training programmes with sponsorship schemes that remove financial obstacles to students but impose some requirement on them to work for the NHS for a minimum number of years in return. But to do it will still require the use of placements to be much more efficient, which, in turn, requires the doctors who teach medical students to become more immersed in education (understand what students have already learned, tailor placement activity to specific learning points, etc.), which many will be reluctant to do.
The above is my opinion. I am not aware of any organisation that shares my opinion.