An MCC certificate (and ideally a training report) plus advanced jet handling from a reputable training organisation is a good start.
That'll be somewhere between £5-8k maybe. But that gets you many more opportunities than just the CPL/IR.
Unless you went through an integrated course, ideally on a pre-selected airline scheme, or through CTC's modular or JOC course and got "introduced" to the airline by them, then you're unlikely to end up on a jet (and not paying paying for it) without some form of previous experience.
That usually means slogging it on a turboprop and earning your experience.
The integrated courses, and particularly CTC, have the monopoly on zero line experience jet jobs. The airlines like what they get (cheap, freshly minted and still-mouldable pilots paying for their type rating) and can get enough of them so they often don't go looking anywhere else except experienced (i.e. multi crew TT) direct entries.
Everyone these days wants and expects a jet job while they're still wet behind the ear. It doesn't work like that though and shouldn't. If you're a lawyer you don't become a partner straight out of law school, you have to earn the experience, show your worth. Same as a doctor, you have to get the experience, complete the on-the-job training before you become a consultant. Aviation is only different because there are some people rich enough or foolish enough to buy their way into the RHS and as a business the airline is not going to turn away free monies like that.
My advice, try the regional airlines, consider moving abroad, be prepared that you'll have to pay for your type rating regardless (either up front or by way of reduced salary) but DO NOT throw the best part of £50k at a type rating and line training with no guarantee at the end.
Or go to somewhere like CTC and do their MCC/JOC at a cost of about £9k and wait out in the hold pool until you get a job with EZY/RYR