Coral "cash out".

Did something completely alien for me yesterday and decided to have a straight £20 treble on Gale Force 4.20 Goodwood @ 10/11, Adele 4.30 Hamilton @ 7/4 and Candelisa 5.05 hamilton @ 7/2.
Having only recently returned to t'internet betting with Corals I noticed a "cash out" feature and after the first 2 had gone in and noticing that candelisa had drifted out to 5's I clicked on to cash out to see what was available but at no point was I offered the opportunity to cash out.

Does anyone know how this feature works and what sort of bets does it apply to? Is it more of a betting in-play feature, i.e. footy matches or does it apply to all bets?

Just curious really. Could have done with candelisa winning too!!

Thanks