I'm not sure where the confusion comes from. The current official intervals from Triumph are every 6000 miles (or yearly if you don't do that many) for engine oil and filter changes and every 200 miles for chain lubing.
Some people choose to change their engine oil and filter more frequently because of their particular style of useage and environmental conditions but if you use a good quality semi or fully synthetic oil I don't believe anyone has any real evidence that this extends engine life.
As far as chain lubing goes I think 200 miles is a bit on the cautious side unless you ride in the rain a lot or wash the lube off. Personally I lube my chain every 500 miles or so, but then I'm lazy. I would also clean the chain periodically with kerosene (as stated in the owner's manual) to get rid of the old lube and grit that builds up (especially if you ride in dusty places). Bear in mind that these are O-ring chains with sealed in lube so what you are actually lubing are the outside surfaces of the chain.
This is the maintenance schedule for the BA (actually the same for all Bonneville derivatives)
BA Maintenance Schedule
[ This message was edited by: PAAS on 2005-07-21 09:17 ]