There's a lot of information on these threads so I'd take some time to skim through it. As ever, take everything with a hefty pinch of salt.
BA and Aer Lingus are the only two airlines (in Europe at least) who will help you with funding. These schemes are highly competitive but definitely worth a shot. IMO they are by far the best way to become an airline pilot at the moment. West Atlantic have run a scheme for PPL holders in the past.
Other than that, some airlines run mentored schemes with no financial help but an (almost) guaranteed job at the end of it (Easyjet MPL etc). Then there are airlines who take on 200hr candidates who have either trained modular or gone through CTC et al. The common denominator with all of these is the requirement to access large amounts of money at your own risk. Until more airlines start to care about social mobility and equal opportunities then I'm afraid it's going to remain a closed shop...