If you really want to guarantee some nice profit you should try matched betting with these offers. I did it a few years back now and made a nice sum, you can’t actually lose any money from it, I just found it a bit tiresome after a while.
The only other problem being I exhausted all the bookmaker signup offers there was, so now I have accounts with every single online bookmaker just about and can’t get in on any new signup offers that catch my eye.
A horse that I have backed looking for some each way value in the Derby is Massaat. Although more in hope than any real expectation.