As Graham says, speak to John, our setup is very good indeed and not too expensive, just need to import the callipers from the USA and lengthen the handbrake cable slightly. Adjustment etc is all the same and it fits the original mounting points.
Are you using these?
http://www.ipsco.org/Viper_files/parkingbrakekitViper.htm
Are you using those mounting brackets, or something custom, and if so I assume they’ve been modified for the smaller disks?
Also what did lengthening the handbrake cable involve?
Things of beauty, aren’t they.
Had forgotten about the cable extension. John supplied an extra length, I really can’t recall if I needed it???
Need to be pre drilled for the correct disc size but given above comments ,308 seems the biz.
Need occasion adjust around mot time
They’re the ones, and they have the correct brackets on file for an S2 Elise/Exige. You just need to tell the OD of your disc. Lengthening of the cable depends on how big your discs are, ride heights and a couple of other things, so it’s a suck it and see.
by the time it’s imported, VAT’d and suffered the crapped exchange rate that’s a fair old whack!
I did check Martin/Steve use the Hi-Spec one.
Whilst expensive, being a direct bolt on with a little bit of cable messing they might work out cheaper than anything else for the S2.
Also I moved up to 315 rear discs without having to do anything to the handbrake calliper but it is very close 
for the S1 its a bit more of a problem though, so a custom design is needed as nothing just bolts on.
yeah slate grey sounds good
or ferrari grey like frank used to sport
I guess, Red calipers are a bit overdone these days … 
I’ve ordered the Hi-Spec ones. I’ll let you know how I get on.