....struggling to find slim and leggy size 6 girls that are 5.4ft (165cm) or slightly taller.... Anything over 5.7ft (174cm) is too tall for me.
Butter_x
Not trying to teach you to suck eggs...but have you tried
AW
Search Button at top of initial screen
Four tabs appear
Tab1 - Gender / Area where you are interested in seeing someone
Tab 2 - Interview / Specifiy height or range of heights AND dress size / body type etc
I ran search using
Tab 1 - Female AND London
Tab 2 - Size 6 or 8
5'4" - 139 Profiles
5'5" - 112 Profiles
5'6" - 102 Profiles
5'7" - 83 Profiles
If you're not already doing that this should help - if you are then this might help someone else....
Good luck