Although Elstree is officially shorter than Denham some would consider it effectively much longer. For take off on 26 the based King Air, the PC12s and regular Renaissance Commander visitor all use the "pan" which gives at least an extra 100 metres of paved (unlicensed of course), although the upslope is significant. At the other end there is a further 170 metres paved (again unlicensed and rough at the edges) with substantial grass run off area.
Most problems arise when 08 is in use for all the usual reasons.
Aerostars are rare but do sometimes visit.
Not saying these are my views, just the reality of what does happen there.