Tips for those new to watching butterflies ( or sorting out old photos).
To sort out the Gatekeeepers from the MBs - look at the black spot on the wing - GK have two white dots in theirs - ( remember gates have two posts) MBs have just one as do SH's
Meadow Browns are bigger but beware oddities do occur that flout these rules!
As for Small Heaths well they uually perch in a slanting position and don't open their wings when settled.