[cheekyangus]

SonicMaster 221,225,272 and 275 have been unused for ages.

I get the impression VM are leaving existing EPG gaps, and those vacated through these HD swaps/replacements, empty with the aim of making the EPG more logical in a larger scale, all at once, change later on. It's easier to do with gaps.

For example, there's a number of cascading changes that could happen just by Channel 4 finishing its switch to HD on 104 (it's currently just swapped in London). If that happened 141 would be empty, combined with 144 which is already empty, and all the C4 channels in the 140s could be shunted along leaving enough space for More4 HD and More4+1 at 146 and 147. All a cascade effect from one change and an existing empty slot.