Took the rotten side steps off.

Drained the fuel filter to find out why she stopped on the way home last night, with the plunger pulled in on filter housing. The decanted 'fuel' smells a bit suspicious to say the least.
But not as dodgy looking as the fuel filter, which looks like it's been off a fair few times. Removed the un-needed centre seal, which had swollen, and bled it. Still works.