There are only really two routes open, do cheap modular training and then work your way up the ranks, or pay for everything from the onset.
Either way, you will need financial stability. Working your way up would start with a very low paid instructing job, or other GA work, probably getting paid around £1000 a month or less, until you build enough experience for an airline to look at you without having to pay for a type rating.
The other option is to pay for a type rating and possibly even line training, which would be £30-40k on top of your CPL-ME-IR (which is already about £50-60k) giving a total figure which could already be over £100k.
You need a solid financial plan to make this work, blind optimism that you will get a job simply isn't enough, as many people find out the hard way.
Just note, I am very happy in an airline job having worked my way up as an instructor and not paying for a type rating, but it wasn't an easy road, and there were certainly times where I wondered if it would be worth it. It certainly was though.