If you have problems with the nose-wheel trike aircraft and are happy to use the generic tail draggers then:
Disable the following files in Addon Scenery/Popham_v2_EGHP/scenery
by renaming EGHP_extra_Nparking.BGL to EGHP_extra_Nparking.BGL.bak
EGHP_extra.BGL to EGHP_extra.BGL.bak

then copy the enclosed three bgl files:
EGHP_extra_PB_Nparking.BGL
EGHP_PBextra.BGL
EGHP_extra_taildraggers.BGL
to the scenery folder to take their place and add some taildraggers.

This should do the trick.