Not a current NHS recruiter but have been in the not too distant past.
I'll be brutally honest - your job history will put SOME people off but definitely not everyone. I have had one boss who refused to interview the best candidate we had for the job because of a work history a bit like yours. I would definitely have interviewed her and I would have been right too because the person he chose couldn't cope with the role! [chews carpet. Remembers thread is not about this].
You do I think need to do a little bit of tweaking on how you present it, but the fact is that your job history IS like this, but you really DO want this job in particular. I would think you have an excellent chance of an interview.
Looking at your job history -
First of all, you have been an NHS employee for all that time. I don't normally like 'Personal Profile' sentences etc at the top of CVs as I think they are usually a pile of w*nk. However, in this case, under your address and email, I think I would put something like
. A career NHS administrator with excellent skills in XX, YY and ZZ. [x, y and z being whatever skills you have that best match the person description for the job you want].
Then I would put Employment History 1997 to Present and the first heading 2009 - present Trust 4, and would put your para, which is a good idea, but maybe try to reduce/focus it a bit, e.g:
Having taken what was considered to be a promotion I found that I had less responsibility than in my lower-banded post. When my previous post was advertised, I therefore reapplied and was happy to return to this team. I was then involved in the following projects:
Project A - 5 word description with IT focus
Project B - 5 word description with IT focus
Project C - 5 word description with IT focus
This role has confirmed to me that data management and use of [system name] and [system name] are elements I wish to be involved with in my next role.
Then I would put employment headings of your actual employing Trusts only, with the main jobs and secondments as bullet points below each of these, so that it streamlines your employment history a bit.
TBH it will be crucial if you can to get the employment history on to 1 page. Were you employed before 1997? I would leave it out at this stage, they can ask you about it if they want to.
Best of luck, it sounds like you know what you want to do which is the key to most of it IMO!