There is some uncertainty about whether Pick will be re-branding to Sky Pick, so they may be waiting until then before updating the channel name and logo to include HD.
It's not unheard of for TV channels to broadcast in HD but not include HD in their name or logo, such as the Smithsonian Channel and Racing TV.
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Channel Guide PDFs updated again (16th June) with the following corrections:
Amazon Prime Video now on 205, not 228.
Comedy Central HD and MTV HD now shown as included in Mix and Fun.
Discovery HD and Animal Planet HD now shown as included in Fun.
Nat Geo WILD (SD) removed from 264.
Channel 4 HD regional variation now indicated on 104/141.
Desktop version:
https://www.virginmedia.com/content/..._June_2020.pdf
Mobile version:
https://www.virginmedia.com/content/..._June_2020.pdf