mc5 - Riddle-me-ree Crescent

Collective consciousness riddle-making. The answer must be a London Underground station name.

My sixth is in EARTH but not present in GROUND

My seventh and last is in NEW but not OLD

My whole is the place where your legs go to fold. ([a] I hope I got the right station, [b] I hope someone understands what I posted.)

Let me guess - its, its... Neasden!

My first is in CHEERFUL but not found in SAD.

My second's in MIFFED but is never in MAD.