mc5 - Riddle-me-ree Crescent

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

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.

My third is in VICARAGE, not in a MANSE

My fourth is in FLOWERS but nowhere in PLANTS