Dear Paolo,
can't help on the use of SSP in different environments as this very iMac is going to be able to serve just as a bulky typewriter sooner or later, yet a few free thoughts in this regard.
I think that the inherent quality of the sound of an orchestra — just the strings in this case — is part of conductor's signature style, eg. I don't like how strings sounds under Chailly baton (as I experienced it both live and on record). A sizzling Elgar is a legitimate reading, then.
Plus, we are constantly facing this unsolvable dilemma: what we hear is it the sound of the ensemble or the sound of the recording? I mean, when we listen to a recording from the mid-50, do we assume orchestras sounded dull at the time? Are we mimicking a way of recording things or giving a personal reading of a piece (repertoire or original)? Why not to render the classics with different sounding strings if it suits "our" sound?
Last but not least, thank you for paying tribute to British string music, something I'm fond of!
Cheers