Nice work mate. Just had a read and your making the right choices with your upgrades/mods!
I was told recently by AMD that alot of the bushes on my car are starting to go. So I'm going for the full superpro polybush kit down there in next couple of weeks. I won't need the dogbone mount though, already had that done, so going to speak to them to check that part(and labour time for dogbone change) is removed from the total price.
I had AP coilovers fitted at AMD and I'm going for the same ARB setup as you. While off yet though
Thats exactly what the told me too
Getting really excited about how it should handle after the upgrades now, cant wait! 
Am sure it's great, probably is better in some way than the Whiteline one but I'm a tight-arse Scot and am also saving for a house so can't really justify going the extra £100
Meant to say about your 007p, that does look like what Forge would describe as "reverse orientation". I've been running mine like that for a while now, a few folks on here do the same. No real issues reported but particularly this way round you might find you need to swap the spring for a yellow one if you're remapped and running higher than standard boost, reason being that this way round the boost is acting against the bottom of the piston rather than the side so the green spring may not hold the valve fully closed when it's meant to be.
That said it looks like you're running a cold-side relocation kit? Maybe that's not an issue then if that's the case, might be better posting the question in the mk1 Leon section.
It is mapped and running 250bhp so should be higher than standard boost. Looked at the forge site and they want £12 for a yellow spring + postage so I think Ill just leave it this way around lol. There is a green one in there currently.
