Dreaming maybe it is both lack of transport and enforced lack of aspiration...and maybe a few other things as well. Areas in severe deprivation often have multiple contributing factors, that's what makes it so difficult to sort out. Out of, for example, 10 or 12 factors, two severely deprived areas might have 8 or 9 factors each, just not necessarily the same ones. So just because transport is ok in one deprived area, doesn't mean lack of transport isn't a real contributing factor somewhere else.
I know what would be done in terms of development to help try to decrease poverty if this was a developing country. And in poor areas of Wales, Scotland, the North of England and also seaside towns the life expectancy etc is often at a developing world levels.
The thing that would basically make a difference would be enabling women, particularly women with children, to set up small businesses. Because when women increase there income, they spend it on their kids- from better food, to decent clothes, to increased educational,opportunities, they spend it on things that build a positive cycle in the community.
There would also be a focus on targeting educational opportunities at girls ( for a similar type of reason).
And there would be efforts to have community development programmes. You know all those child sponsorship charities? The money/benefits don't go to individual children. The money is spent on community development (from well-digging to education) that benefit the whole community. I.e. Improvement in infrastructure. Because if help is targeted at individuals 1) those individuals are resented 2) they often move away to cities etc in search of a better life/escaping the resentment and so the area remains deprived (in effect you just end up stripping communities of their best and brightest that way) 3) the cycle of deprivation just doesn't get broken if all you do is empower some individuals to escape the area 4) if a Community is poor, it does affect the spirations of all those in the community, so providing things that benefit the whole community has a massive effect on what people think is possible for themselves, their neighbours and their children. I think the old fashioned way to describe it is, it gives them hope, and hope breeds both possibilities and actions.
So I would say, a combination of infrastructure improvements that are conducted at a pace that they provide both educational and employment opportunities for local people, plus support for people to set up small business and increased educational/training provision.
Infrastructure improvements could be round transport, or enhancing digital connectivity as a first thought. Improvements in educational opportunities are another obvious way to make infrastructural changes. It could be round things like wind and wave farms if the wind and waves are strong enough to support that. But they need to be done in such a way that's it's not just shipping In skilled people from elsewhere to do the work then shipping them out again.
The educational provision needs to be for knowledge/jobs/skills that will actually benefit the local area, not mean that someone, having had an education, needs to leave to go and work elsewhere I.e. No brain drain. So some emphasis on moving things out of London so there are more and better job prospects in other areas.
There is no point in people leaving to get work, even if they send money back. There are massive problems in some areas of Eastern Europe now, where they are literally no young, fit, economically active people left in some areas. They are loads of ghost towns. Another problem in that type of situation is that the gap between local average pay and the cost of living (specifically round property) grows. People working abroad buy property, or send money home to their families, and the people without those links are priced out of local markets. And that puts terrible pressure on those people who are still in the areas that have few opportunities, but now face higher costs. In some Eastern European countries at the moment, the gap between local minimum wage and real cost of living is bigger than in some Asian countries that are traditionally associated with sweatshop conditions in the (little) employment that is available.