As the title says really... How to?
All the manuals say how to top it up/check the level, but I can't find any info to find if there's a drain plug anywhere.
I'm gonna do an oil change soon (next week), I thought it might be nice to do the gearbox oil at the same time. Is it possible, or would I have to remove the engine (or park on a steep bank

) to do it? It changes ok, although it can sometimes be a bit unwilling to go into third, and have been known to grind it from time to time (lazy left foot syndrome

), so just think it might help it be a bit slicker. if I can't then I'll check it and top it up, but would like to change it...
Oh, and anyone know off-hand what size spanner is required to undo the oil filter housing? I've done it before (using molegrips) so I know it's something like 30mm. I'l like to get a decent adjustable spanner that's big enough though, so I don't end up shredding the poor thing, but can't be arsed to jack it up to get under and measure it

Biggest spanner I saw last time I looked went up to about 35mm, and I want to be sure that's gonna be big enough before I buy one.
thanks