So who/what exactly is Bird? If he's a "professional photographer" employed as such, we can assume he has a degree in photography, or did the police, having spent time and money on training him as a police person, then recognize where his real talents lay and pay for his degree? I would have to ask the same of the other two "on the rota". Did EP employ THREE "professional photographers" all with degrees in order to make a random pick from the rota "as and when a major incident come up and they require a photographer"? That's a lot of salary to pay on the presumption that "a major incident come up" don't you think?
Your questions are easily dealt with and I am surprised that you felt the need to ask them. But here we go anyway:
1) Who/what exactly is Bird?
Let's read the excerpts and see if this question is dealt with. It appears, using the simple tools of reading and comprehending simultaneously that this is explicitly dealt with.
"Yeah, my job is to take the photographs..."
"You then go on to the mortuary...to do your specialist job again, take the photographs, yeah."
"... when a major incident come up that they required a photographer..."
"And with the greatest respect to you you were there as a photographer."
"... there's nobody lower than me, the van driver and the photographer."
Five references in seven sentences makes it pretty clear to me and surely everybody who/what Bird is. For those who are unclear, the answer is; Bird is a crime scene photographer and employed as one.
2) Your second and third rather meandering and loaded questions basically deal with the same point whilst attempting to appear to use sound reasoning to back up your straw man assertions.
We do not need to assume either that Bird had "a degree in photography" or that EP funded a degree on his behalf. That is something that you just made up to bolster your weak argument which is coincidentally, exactly the same as Caroline's.
Had you done a quick search on photography qualifications/courses then you would have discovered that professional photographers do not all have "degrees in photography". But why use facts when your preferred form of debate is instinctive knee jerk bias.
Using reason and basic comprehension, again, to address your questions. Yes EP did employ three photographers. They would do this because of the importance of the role. The rarity of its requirement only goes to emphasise the importance of having experts/professionals on hand 24/7, hence a rota. That other duties were performed whilst on shift is hardly surprising really. Your use of unnecessary and incorrect adjectives to describe the rota betrays your knee jerk reasoning.
The whole concept of a rota means that you don't need to make a "random pick". You look at who is on the rota at that time. If the concept of how rotas work is too difficult for you then you are way out of your depth.
Your final point/question is no better informed than your previous ones and again betrays your poor reasoning. Of course the police work on the presumption that a major incident will come up. They're the police, it's one of their main roles, dealing with major incidents. It would be more concerning, much more concerning, to find out that the police worked on the presumption that no major incident would come up only to be left floundering when one did occur and having no specialist staff available. They are the police after all. I'm assuming that they have this covered.
As for believing that it is a lot of salary based "on the presumption that a major incident come up".
Has it really not occurred to you that the reason Bird and the two other photographers performed other duties was so that they were usefully employed and always on hand for their "specialist" role.
As a tip, you ought to skim read less and perhaps read slower in order to understand the words you are reading. Then have a little think before you hammer away at the keyboard. It should lead to less comprehension errors.