SkyGo Airplay audio problem

I wasn't sure which forum this problem falls under, so my apologies if I'm in the wrong place.

I'm using the SkyGo app to watch Sky TV on my laptop. The problem is, I can't get the audio routed to my Airplay speakers without the audio being out of sync.

Incidentally, audio works fine if I'm using the SkyGo app on my iPad, with audio routed to the Airplay speakers. It's just on the laptop it doesn't seem to work. (I've even tried mirroring the iPad on my laptop as a workaround, but SkyGo has deliberately blocked that option for some reason).

Any thoughts on how I might solve this pesky problem?