Tipulidae or Dixidae

Tipulidae or Dixidae

Observation - Tipulidae or Dixidae - UK and Ireland. Description: I keyed both of these flies out as tipulidae, until it cam to looking up the description where it said they should have a discal cell on their wings. Neither species has, so I returned to the key and assumed I had mis-identified wing veins. Both then came

I keyed both of these flies out as tipulidae, until it cam to looking up the description where it said they should have a discal cell on their wings. Neither species has, so I returned to the key and assumed I had mis-identified wing veins. Both then came up as Dixidae. Can anyone shed some light on which it is likely to be?