Read the NHS plan for the next 5 years. That is exactly what its focus is on, especially in relation to Cancer. Evidence is strong that survival rate is directly linked to early diagnosis.
The problem is that for this to work, you need good primary care (GP), not so much for them to follow the correct pathways, but to build people's confidence to go instead of thinking 'no point in going, I won't get an appointment for a week and that my GP will tell me I'm being silly, I'll wait to see if I get better'.
The other problem is that for any early depicted condition, you have many people going for more appointments, more tests, which for most will come out fine, so it's a lot of potential added pressure on a system that already can't cope.
The NHS is a chicken and egg institution. It's all good to focus on preventive, but doing so with the current resources will have a serious impact on current emergency care, let alone non-emergency. Give it more money is good of course, but it will be a very slow process until the good comes out of it. It will need to recruit new good trained staff and for this, we need to train more good people. It will need to cope at some point with treating more acute people whilst investing heavily in more preventive work. Preventive work always take quite some time to get off the ground, so in the meantime, it's a lot of pressure on staff who are already under much pressure, and this can lead them to leave the NHS, which takes us back to the start of training and recruiting.
If we get more funding and do things right, it will likely take up to 10 years to really see the benefits, and politicians love to make their print into everything, no initiative lasts longer enough to make that impact. We are stuck in a wheel of initiative driven policies which are then put in the bin for new much more innovative policies, which are not much different to the one before, and off we start again, wasting money, never going far enough to see results, whilst people's morale is whipped.
That's the NHS, and it's all down to us, mistrusting and always pushing for change.