It is mostly BBC iplayer.. I can just live with SD content, but when I view HD it is impossible. I never had an issue with my old V+ box...
The other content, like Ch4 are all SD and again they are like the SD content on the iPlayer and you can get away with it, but yeah I am quite surprised that the OD and iPlayer are being used by two different technology.
I will give VM a call over the weekend as I do not get a chance during the day (hence the late reply), but the way I am getting away with it is to Chromecast the content from my Android or PC to my TV and watch ondemand that way. Always super smooth in HD