The SP's are available on Betfair.
Near the top of the page, go along to English - Aus & NZ, and change it to English - UK.
Then choose Horse Racing from the black tab.
Then just below that click on Form/Results.
That opens another window, from there select Cards & Results.
Then your away with the calendar or yesterday's results.
Click any meeting, any race etc and you get the full results, including BF SP's and the %.

I've found our SP's to be a bit hit & miss, with a lot being less than 100%.
Once I've built this bank up I'll be doing USA SP's as well. They are all over the place ranging from 70% to 130% just in the last couple of weeks. It must be down to the amount of $ available.