southside bobby
Of course Stobart chose MAN as a new destination from SEN partly in order to be able to offer "these "extras" as destinations available from London-Southend". That's exactly what they are: additional destinations, and some quite useful/viable ones at that, to add to the attractiveness of SEN to travellers.
SOU do exactly the same so do you suggest there's some sort of trickery at play there as well?
Good Luck ... EXF