Calling this a 'Spilt Approach' is a compete misnomer. In the 30 years I have been flying them I have never heard that name. A more correct description would be a 'Joint Approach', as both pilots have a very real investment in the flying of it. HUDs are utterly irrelevant to the concept, not least since at 1000' the captain takes control, with the full expectation of landing without needing to see anything as there is no decision height!
A 'Split Approach' sounds more like the kind of approach flown by others, whereby one pilot flies the approach, whilst the other falls asleep! What could be more spilt than that?
As others have said, why even worry about it? If you work for BA, do it, and if you don't work for BA, why do you care?