Good luck trying to find a B757 job! I know a few guys out there who were on my B757 TR course, who 18 months later do not have jobs following the Silverjet and Zoom collapse. Most of them are looking at jobs abroad in Portugal or Italy...and further.
You should have signed upto a course with Base Training and Line Training sectors included. Without experience, you're
You could try contacting Astraeus in LGW. They do base training for new TR guys, but you will probably have to pay a few thousand more for sim assessments to make sure you can fly, and fly to their SOPs.
When you do get your rating, you can always apply to other type operators. Having a TR on your licence may get you through the door somewhere.