Originally Posted by
DaveReidUK
Sadly, the explanation is more earthly - VSEL (Vickers Shipbuilding and Engineering Ltd, latterly part of BAE Systems Marine) to whom the prefix (VSB) and callsign (Vickers) is still allocated.
They had (may still have) a couple of King Air 200s based at Walney Island.
I thought it probably was but the image of a couple of pilots in dog collars still makes me smile!