Hi, I have been offered a new job on the understanding I get satisfactory references from previous employers. 2 of my last employers are in the process of providing the references but my last employer hasn't responded to the request from my new job for a reference. i left my last job working my full notice, it was a small company and I reported into one of the owners. I worked very long hours and they didn't believe in paying overtime so was expected for you to do everything and anything they threw at you without any training or support and had no care for health and safety issues for their staff. I didn't enjoy working there or working for the owners to the point I left without a job. I did try and talk to the owners on a couple of occasions to flag my concerns but they weren't interested all they were bothered about was making money. I wasn't happy so I resigned formally and worked my full notice and have not spoken badly about them in interviews or anything so tried to be as professional as possible in what was for me difficult circumstances. They are now not providing a reference to my new employer. I don't know what to do in terms of my new employer or last one, has anyone else experience anything like this and have any advice ? Thank you