I think I've worked out what VM has done, it's very poorly implemented (as usual) but there's new free On Demand content now available:
Home > On Demand > Box Sets > Channels > Food Network
The folder now includes various TV series from Discovery that are nothing to do with food.
They can also be found in:
Home > On Demand > Take a Break
All shown as being from Food Network, so although that's incorrect at least it's easier for people to find.
The availability of content from Discovery is very limited and inconsistant anyway, it is odd that out of their 6 free channels we only get On Demand / Catch Up content for 2 of them (Really & Food Network). I wish VM viewers could also get content from Quest, Quest Red, DMAX & HGTV).