I actually haven't changed the oil on mine myself yet, partly because I'm lazy and partly because I prefer to have maintenance done for me for the stamps in the service book, but looking at http://www.worldoftriumph.com/trium...ck_01=&block_02=100053728-1-2&block_03=610510 it seems like the plugs are M14/1.5, so that's one bolt size down - two plugs in the sump.
That leaves the notoriously weak bolt in the final drive unit, and unfortunately the site doesn't list a size for that. Anyone know? It would also be a useful bit of info to have if or when it snaps.
Unfortunately the same thing as with WorldOfTriumph - just says "plug, oil drain, magnetic". So it already should soak up filings, but uprating the magnet might be fun to do just for the hell of it, I thought.