Hi Chris, In simplistic terms, spring rates/colours are as follows:-
long hard
IF348-916 9-1,6,L95 red
IF348-1016 10-1,6,L96 dark blue
IF348-1014 10-1,4, L95 light blue
IF348-1116 11-1,6,L95 lime green
IF348-1114 11-1,4, L95 dark green
IF348-1216 12-1,6,L95 purple
IF348-1316 13-1,6,L97 white
soft
medium hard
IS106-816 8-1,6,L84 dark blue
IS106-814 8-1,4,L84 light blue
IS106-916 9-1,6,L84 lime green
IS106-914 9-1,4,L84 dark green
IS106-1016 10-1,6,L84 purple
IS106-1116 11-1,6,L84 white
soft
short hard
IF350-716 7-1,6,L70 dark blue
IF350-714 7-1,4, L70 light blue
IF350-816 8-1,6,L70 lime green
IF350-814 8-1,4, L70 dark green
IF350-916 9-1,6,L70 purple
IF350-1016 10-1,6,L70 white
soft
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Hope that helps you out a bit, I believe you can run the long springs in the rear using the medium setup; and it results in a slightly softer rate in comparison. I've not had chance to try this out personally though.
Fingers crossed I should be pitting with Rob at Stoke on the 28th,
and I've got a most of the above springs; you're more than welcome to try some out, just give me a nudge.
Colin