The Lifestyle channels have been moved down to allow more space in the Factual category numbering. Not been confirmed officially, but it is bound to be for Sky Nature, Sky Nature HD, Sky Documentaries and Sky Documentaries HD. Factual ended at 276 and Lifestyle started at 278, which clearly isn't enough for 4 consecutive channels, so Lifestyle now starts at 285.
"Not been confirmed officially, but it is bound to be for ......"
Which is exactly what I guessed and implied.
However, I wouldn't be as bold to state it to be bound to be the case with Virgin Media.
In any case, as with this and other threads, the point is I pay VM to supply a service which includes accurate and timely information. Having finally got a fixed point where a downloadable Channel Guide is located with news on changes, they make changes without maintaining and updating those areas for sometimes weeks or even months.
I also wouldn't state that there are real boundaries between Categories. The boundary between Entertainment and Factual has been badly blurred for years with the incorrect categorisation of channels to hide it!!