No way they were angled backwards. On the Vulcan B2's they were directly behind the starboard undercarriage doors and pointed straight down.
With the Vulcans I worked on, for seven years, Ground Power connectors were well aft and inboard of No 2 engine, and they most definitely angled rearwards - for the purpose previously discussed. No question about it.
Pic from Andy Leitch's Vulcans in Camera. (Is Andy still around?)