Is a Manchester Stns->Elstree and Borehamwood journey possible "not via London". There does seem to be such a fare available. If so, what would be its routeing? Via Chesterfield?
When I try the routing point calculator if I use a route of "any permitted" it tells me the only valid destination routing point is West hampstead thamelink and if I use a route of "not via london" it tells me there are no valid destination routing points.
For Manchester to West Hampstead thameslink, in addition to "LONDON" the routing guide offers
BM+BP+MI - WCML routes to birmingham or nuneaton. Then over to Leiscter and down the MML
MH+EM - Manchester to Stoke on trent, then across to Derby or Nottingham and MML routes from there.
MS+EM - Manchester to Sheffield, then MML routes from there.
NR+BM+BP+NI - Mostly the same as the first option, except it would also allow travel to birminham via the CLC to Warrington.
PR - Manchester to Sheffield, then MML routes from there. Seems to give less route choice than MS+EM