I've not attended one but i've passed the assessments, everything you need to help is on this forum. Save your money would be my advice....even having passed i still didn't get the job. With the downturn in the FOC world, competition will be even higher for any TOC jobs which arise, or i'd expect so. I've pretty much given up on joining the rail industry, it can become an obsession of sorts and disappointment is all too commonplace. Not that my words will have any effect on your quest
Good luck, spend the money on a good night on the peeve, it'll be as useful
Digressing slightly, What happened with your self regarding the Heaton job.