No flight school, or airline course for that matter, will guarentee you a job. Some FTOs offer a sort of work experience scheme for 6 to 8 months with a partner carrier. Those carriers only use them due to cheap labour and partially offset TR costs. If you are lucky, you might be kept on.
If you were expecting to be placed, found a job, with a UK airline you can expect a long wait. Schools can't create jobs or predict the future. Neither can airlines. China and the ME are looking, and will be increasingly so. Hopefully they will start to get involved in FTOs in Europe when they realise a need for well trained ab-initio pilots.
Timing is everything in this game sadly. I had a very long wait after finishing in 1992. But I stuck at it, and got a job. All came good in 1996 when I landed a job with one of the big boys of the time! So there you go. No school even offered to help with a CV then ( not in real terms).