They get a logical channel number because that's how DTT has been set up in this country. [...]
The EPG itself contains a lot of junk, e.g. the red button services have EPG programme information even though they don't have programmes. [...]
The EPG obviously is a useful function but also occupies a similar amount of space on each multiplex as a couple of radio channels.
On the other hand, having EPG information for LCN 200 and 206 at least are able to give a clue to newbies as to what they are for.