Hi Aine,
Already pointed out there but the live streams are usually the quickest and cheapest option to get a view in. However, you might find you don’t get all the build-up etc. Occasionally if there is a problem at the track you’ll miss that too (for example an injury or delay).
Racing TV (formerly Racing UK) typically shows the best quality racing, with the better views surrounding them. For your matched betting its unlikely, this will make much difference but that’s the difference. For twenty quid a month you can’t really grumble, but from your comment, I wouldn’t really worry about it.
If you’re logged in to your Betfair account and have a bet matched on the exchange you can see them all here:
https://video.betfair.com/
Cheers,
Caan
p.s. if you’re matched betting near to the off, just be aware there are delays between reality and streaming. Typically 2-8 seconds.