Your post implies that you don't already have a MEP Class Rating, in which case you need to do a minimum of 28 hours flying training.
You can save yourself £128 though, the CAA have got a buy one get one free offer on at the moment - you get a free class rating with CPL issue.
Don't forget that there is a requirement to have a night qualification as well.
And £70 for a 170A - considering that there is no longer a flight test, I would expect that to be thrown in with the course.