I would definitely not recommend Universal Extras, their staff are rude, unprofessional and unhelpful and their pay is well below the standard you should expect.
In one example, I was phoned on Saturday night to commit to a job the following morning. When I queried whether my travel would be covered, I was spoken to as if I’d just asked for a million to do the job. The member of staff actually shouted at me down the phone for twenty minutes, and made me feel about 2 ft tall.
If you do decide to join, be very careful, and do not be made to feel as though you owe them anything – you don’t. The work they do get is extremely few and far between as well.
Hope this helps you