If you use the shops you will get on ew this week without too many problems in my experience. I am not actually sure that it is that great value in this race though because for once you really are giving a lot away in the win portion of the bet. For example betting 12/1 ew Dream Ahead you are getting 3/1 the place about a 2.2/1 shot so a positive expectation of £25 for every hundred but if you assume the horse is a true 20/1 shot then you have a negative expectation of £35 for the win portion @ 12/1 and that assumes you are getting a quarter the odds.
Yeah obv u can get on in shops more or less, but who wants to do that!

Prefer grntd priced and not having to share space with the local geniuses tbh.
The frankel race is not a race the bookies will want to take each way bets on. For a start most go 1/4 the odds,-therefore u MUST shop around, not all odds on shots win, and i'm not sure about those stats you've highlighted-tbh the way you've arrived at the numbers confused-but interested me.

You get 2.25-1 on
excelebration placing when after comish it's an even money shot on betfair. This one is about 11-1 on betfair and imo is a cracking ew bet.
Dettori's rag in the race is available at 125's ew, therefore you get 31.25-1 on the place, on betfair it's less than 12-1 to do so.
I don't see how there isn't value in backing these each way, you can't just completely right off the win parts either, but yr negative expectation comment does intrigue me, not sure how you get at those numbers tho.
Oh and wiiiiiiiiiii canford!