Can you smell it when around any of the tires, i can smell it from the front right....
I hope its not the clutch as it doesnt slip, changes gear fine etc... sometimes i can be a little heavy acually moving the gearstick into second/ first but i have hear this is normal.
Its deffo not the pads (mine a re new and smell was there before and after)
If it happens again I'll check. Think its heat on rubber that comes in via vents maybe... my 1st to 2nd is the same as yours, think my clutch is due a change and so is the oil in the tranny.
A