Will be fitting a new front pair of struts soon and also the rears and the only thing I'm especialy concerned with is the integrity of the hose seal as it goes into the fitting to ensure it's leak free and I don't have to redo the job.... Any advice / tips are welcome on how to not mess this up  2012 TDV8 Vogue (L322)

It's a brass olive on plastic pipe, my struts came with new olives and nuts, I cut about 10mm off the end of the pipe till it was clean, then new nut and olive and do it up being carefully not to cross the thread, although it does fit very well and it's unlikely you will...

Then just do it up, make sure the olive is far enough down the pipe, it doesn't have to be real tight to seal, do it with fingers then about 1/2 to 1 turn, you will "feel" when it's done.

I was apprehensive about the first time I did one but it's one of those jobs you can over think and worry about and it's very straight forward....

Good luck...  Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
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Historical advice was to leave the connection alone and refit with the same one that came off (not disturbing the olive on the pipe, keeping the original nut). This had worked OK for me when changing the front struts, and when removing/replacing the rear bags. Of course, this requires that the pipe/olive/nut is not damaged in any way / was not previously leaking etc. .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Did mine not long ago. Access to the airline is good compared to the rear air bags as long as you have a short 12mm spanner.
I used my old connector and all is good.